On some things, yes, on others no. Guantanamo Bay was a principle over practical decision and he went with practical, which I disagree with. He's never been aggressively anti-war. He was aggressively anti-Iraq War. He always wanted to continue the Afghan War. On the unionization issue, while I'm pro-union, I don't think the president had any reason to jump into a state issue on that one. The bigger let-downs for me have been the extension of the Bush Tax cuts for the upper percentile, GITMO, and not pushing harder for a progressive HCR bill. On the whole, I'd still vote for him again, but he hasn't been the golden boy of the progressive movement. In all fairness, he never claimed to be. If there were another viable option, I'd consider it. If there isn't, I'll stick with Obama.
The most disappointed in him seem to be people that had nothing invested in him in the first place. I'm speaking of people that never would have voted for him anyway. In that case, they aren't really disappointed. They didn't have their hopes up about him to begin with, so technically, they couldn't be disappointed. They're actually just dissatisified with him in general.