Begins was such a surprise when it came out. The stink of Batman and Robin was still so strong I was leaning toward not seeing it in the theatre. My girlfriend (now wife) actually talked me into a double date with her friend to see it. I left in awe that a Batman movie could be so good.
However, it's a little slow.
I've only seen Dark World once but it did adapt one of my favorite Thor stories. It was better than the first one but the humor didn't mesh as well with the action.