Origins by far. It just feels like more of a rpg. And I'm not a big fan of the conversation wheel in Inquisition and DA2. While it is nice to hear your character speak, it feels limiting to have only 2 voices. I haven't played with a dwarf, but neither voice seems very dwarf like. And by saying Origins is more RPG, I mean the game offered the most choices. Yes you can even have a warrior that uses bows in Origin. And if I recall correctly, you could have your rogue use a sword and shield (although that isn't advisable). Warriors could also dual wield in Origins as well. Mages seemed to have more spells as well.
And I admit, I really liked the grey warden plot, and I like the darkspawn plot. A lot of people didn't like the cliche monsters taking over the whole world bit, but I did. And really, you weren't even fighting for the entire world, you were fighting for Fereldan (presumably, if you failed, Orleis Grey Wardens could have got the job done, although Fereldan would be completely wiped out). Going into the deep roads was fun, something Inquisition lacked (although I think they did have one small portion iirc).
I even liked the fade that everyone else seemed to hate. Although I wouldn't mind if that section was a little shorter. And some people didn't like the Brecilian forest either, but I liked that plot as well.
I liked the character leveling system as mentioned above, you have a lot more flexibility in how you develop your character. It's not dumbed down as DA2 and DA:I. Let's admit it, the character leveling system was dumbed down.
One thing DA:I has over Origins by far is the exploration. Origins outdoor areas could be very limiting. I like the outdoors in real life, so I like the outdoors in rpg's, so I like roaming around mountains or forests. I wasn't a big fan of DA:I indoor areas though, there were no big dungeons like the deep roads, or the werewolf layer. And some of the indoor areas seemed big in scale (not the overall size of the dungeon), like MMO type big. Big interiors are necessary for MMO's, but I don't think they are necessary for Inquisition.
Graphically Inquisition is much better than Origins without a doubt. But Origins is passable, and enough to get you immersed into the world. The art style was pretty good as well, a step up from the horrible art style of DA2.
Now for combat. This one is hard to compare. Origins was way more tactical, at least that's how I played it. I controlled all my characters. Inquisition is more of an action game, but the action is fun. I can't complain about the combat in Inquisition, except the dragon fights which were too long and annoying, but the dragon fights in origins were this way too. The dragon fights in Inquisition I rate worse because it's harder to control the rest of your party in Inquisition. Origins combat is just easier, just not as fun from a action standpoint. But strategically, Origins was more fun, as you had more spells, and more things to do. You could come up with several strategies for a combat scenario, where as Inquisition you often do the same thing every time you enter combat.
On the surface, Inquisition feels like the better game. But once you finish, there is no reason to replay the game. It's too long to replay (way over 100 hours for me). I tried playing as a Qunari mage, but no one really reacted to my unusual race/class combination. I only played a few minutes. Origins I have played through at least 5 complete times. The game is that good. Where as in Inquisition, despite a couple of attempts, I have been unable to replay Inquisition. But maybe some day I'll play as a mage.
DA2 I haven't mentioned too much. I did play the game twice. I even tried installing some nude mods to get me interested in playing it again, but I just can't get past the beginning of chapter 1. I just don't like this game very much. Nude Isabella isn't enough to get me to play.
. And then the annoying Templars and Mages plot. My least favorite part of the Dragon Age universe. Which is another flaw of Inquisition, more annoying Templars and Mages plot (to be fair, one section of Origins had this, but overall it's a small part of the game). I'll take Grey Wardens and darkspawn any day. But I realize that plot is unavailable since the blight doesn't happen that often.
As for humor, I'd rate Origins and Inquisition equally. They both had some funny parts. Oghren and Iron Bull being the highlights here. I didn't romance Iron Bull, but I seen youtube of it. Very funny. But don't just watch it, it's better if you play the game so you understand the personality of the characters (especially Josephine).
DA: Origins > DA: Inquisition > DA2
Awakenings was pretty good too, though the dlc for Origins wasn't very good. I haven't played any dlc for DA2 or Inquisition.
