I think that Obama has done pretty well at compromising on certain things, whether that is the recent tax break extension and the reduction of estate taxes, etc., but I think the bad thing is closely related to that. He doesn't seem to use that political capital gained from those deals to good effect.
There seem to be times where he ought to be saying hey, we did this deal and now it is your turn, but he doesn't appear to do that. But I am obviously not in the meetings he is in and don't know enough to be too critical.
It is a delicate balance being president. I know that some people are frustrated that Obama has not intervened in Wisconsin. The situation there does seem to call for some leadership, but it could also be viewed as a states' rights issue. The bottom line is that Obama has not been as visible as some would like. I imagine he is following the situation closely, and probably acting behind the scenes.
I assume you are talking about Pres. Obama, not about presidents in general.
For not well, I would say legislative leader. I do not think that he has done a good enough job of showing leadership on many big bills. He seems to be content to let Congress lead. I think he needs to be more upfront on things like deficit reduction now (and he should have led more on health care).
For well, I would say head of state. He seems to have done a decent job of representing the US -- of being the image of America that the world sees. He doesn't seem to annoy foreigners the way Bush did.