Burnside performed badly in his efforts to get across the bridge that bears his name then falling prey to pessemism later on in the battle, but its hard to say how much of this was him being obstinate to McCellan after his perceived demotion. Porter has a black mark against him for arguing against pushing Lee towards the close of the battle. Sumner was attacked after the battle and heavily criticised by historians ever since but recent research suggests he didn't do as badly as people have thought. The remainder mostly didn't do too badly but as you say were hampered by the fact that whatever moves they made were isolated from those of other commands making it easy for Lee to switch reserves to meet the threat.
I must admit it's been some time I last actually looked into the issue of Antietam so I cannot possibly remember everything but pretty much that is the general picture I gather as well.
However I think it's always important question to ask since example if we consider Gettysburg and Lee & Longstreet, we can see that almost anyone can not to get along with each other in pivotal moments and it can have dire consequences. Who's fault it is depends greatly of many factors so it's possible that we might little bit are too tough for McClellan and it's possible example certain subordinates failures played also part in McClellan's hesitation to commit to the battle. I doubt it, but I cannot recall any better the course of the battle.
He would have made a good staff officer ...unlikely given the amount of blood shed and the irrevocable stances of the two parties.
I cannot anything but agree with your view of McClellan.
Like already said, I think he just lacked the edge that would have been required from the general of his position especially when being against foe like ANV.
That might be true but I don't see any reason to treat the results of a battle from a purely military viewpoint when assessing success or failure. Generals fight battles to achieve a change in both the military and political situation, they don't operate in a vaccum and frequently base their decisions on what political consequences may arise. Hood for example stood next to no chance of shifting Sherman from his positions around Atlanta but knowing that he'd been put in charge with the specific aim of attacking Sherman and driving him back he had little choice but to do so.
I kind of disagree here.
I think it all depends what we are defining and measuring. Even if Maryland campaign might have indirect goals (like that of gaining momentum from the public etc.) when considering the military aspects we have to concentrate into the direct military consequences rather than something that cannot even be clearly defined.
I have found extremely hard in the past to debate with some other people about history that see history of warfare somehow always related to the politics and not being able to see the actual tactical and strategical side of the warfare without the politics. Even though it's clear military is always tied to the politics it's also dire mistake think that in the battlefield where it's about the survival of your troops and possibility of gaining military advantage that politics play such big part in them. Politics can be seen as setting goals for battles and campaign which we can later rate as of success or failure based into the specific criteria and politics can motivate generals do decisions in the field towards specific goal but when considering the military aspect only I think politics must be set aside and ponder only those immediate results rather than something that might or might not be result of military operation. As mentioned though and being one of the themes I have mentioned that these politics do play part as psychological factors for armies and their leaders when they plan their actions but purely militarily they are just that, psychological factors and not raw data that can be gathered and analyzed.
Otherwise we're dead on water with history that is straight line without the possibility of creating those What-if scenarios and really analyzing military decisions or their actual results from military pov.
Example in case of Antietam it's clearly almost impossible to rate a result for both sides that would have caused example Lincoln not to make his declaration or that would have caused foreign power to show their sympathy towards South. We can even ask was that kind of success for South could have been possible in those circumstances so are we measuring their military success with a stick that has wrong scale on it, after all if we consider the political goals as the defining aspect of success and failure of Maryland campaign?
And if Maryland campaign was defeat for South it must be victory to North and we might ask with what grounds if considering the military aspects? What were their goals? Is that they didn't lose more ground good enough for an excuse when they didn't use their superior man power to overwhelm their opponent and make it beg for mercy? I don't think neither of the sides militarily achieved anything special so that's why I consider it inconclusive. There are some points favouring either of the sides though so in the end the rating of the result depends how you value example man losses.
I think this is very important question considering the whole issue of this particular thread and that is how military success or failure can be measured.
I consider it almost strange that winning side like that of Union can get away with lots of stuff militarily just because the side won and reached the political goals while Condeferacy's success is always measured from also political viewpoint making any kind of actual rating of their performance based into military type of stuff almost impossible.
And this isn't only about Civil War but also about other wars as well. IMHO there is time and place for everything and political and military aspects of operations can be measured either together or separately.
I'm not promoting "vacuum"-thinking but I think the different fields of any conflict can be viewed and measured separately while of course being linked to other factors. Just putting everything together might give you clearer picture of the course of the events in general but at the same time the important details and specific aspects like that of military are simply forgotten. I believe this is one of the follies of some of historians and I find it just awfully bad error.
There's a lot of truth in what you are saying here, but I believe that was just one aspect a;beit an important one of how Lee made his decisions.
Certainly, but I mention it because I believe it tend to be overlooked as a trait of Lee while I consider it being almost his defining quality. I think as long as he could he was looking forward for such a battle but after the defeat of Gettysburg (and I think this quite well explain's otherwise totally militarily insane Pickett's Charge) he was absolutely gutted to just sit and watch or play cat and mouse with Grant while South was being torn apart.
In the end it was all matter of time and simply there wasn't chance to pull that one rabbit from the hat to save it for the Confederacy.