Seeing how Obama is very far away from being the most inept president of the 20th and 21st century - heck, his predecessor was far worse than he ever could have been - I have no idea what point you are actually trying to make. Probably the same old stupid "Obama is teh Devil!!1!" bs that tea party fans like to throw around. Obama has been very average, partly because of his own behaviour, partly because the Republican party went off the deep end and turned US politics into a mockery of itself.
Obama can be seen as average...as long as you don't consider the initial conditions of his term. There is an intense desire, particularly among Republicans but present to some degree in everyone, to not acknowledge how bad things were in 2008. Republicans are driven by shame, the rest of us by fear.
An indication of that reality...
The President of the United States approached congress and said 'we need to just hand the Treasury Secretary a
trillion dollars and let him distribute it as he sees fit with no particular oversight at all. This is the only way we see to avoid an economic armageddon beyond what has become known as the great depression'.
This truly outlandish and unprecedented idea was not met with scorn, because it was frankly believable. That armageddon
was palpably immanent, and there wasn't anyone jumping up shouting 'that's crazy and here's a better idea', although there were plenty shouting 'that's crazy' because it actually was, even though it was fitting with the existing conditions.
So while Obama can be seen as 'average' in regards to his accomplishments, if you look at what was
averted during his term he's pretty remarkable. I supported McCain, but in hindsight I'm not sure he could have gotten us through.