Imperialist? Do you even know what that means? Imperialism is if he wanted to stay there indefinitely and somehow have the US gain from staying. He's said repeatedly that he wants to move out responsibly by 2011, no one wants these wars, especially him. But destroying Al Qaeda once and for all is keeping him from just up and leaving. If this isn't done, it's possible we could have another 9/11 on our hands. He doesn't want THAT blood on his hands. These are tough times, and the reason some people are dissatisfied is not really because of him, but because of the situation and the fact that there isn't a fully right answer.
Health care reform isn't a disaster, the AMA fully supports it. Some far-left liberals are fuming because it doesn't have the public option. Obama was 1 person away from getting it done, but like he said, it has almost every measure he campaigned for, except the public option. It'll do a lot of good, just watch.
It's been 11 months, you can't expect him to have everything done this early. What's important is, he's beginning to get things rolling: from climate change and carbon emission caps, to nuclear disarmament (even won the nobel peace prize, albeit a bit prematurely but still won it because of his EFFORT which is the point of this entire argument by the way), to regaining the standing of respect to the rest of the world.

That's not bad considering HOW much stuff he had on his plate when he first walked into office. Today, less than a year later, the economy has begun to bounce back, jobs aren't being shed per month but rather gained, it's on its track.
Effort my friend, you cannot say he hasn't put that forth. If you do, you're a blind man speaking out of anger over his policies.