A wise man once noted that it’s a fine line between clever and stupid. There is also a fine line between fun and irritating, between banter and bickering. Iron Man 2 crosses all of those lines, in the process creating the most egregious misstep in the entire Marvel Cinematic Universe to date. Yes, more so than Thor: The Dark World, which for all its problems still has really good chemistry between Thor and Loki. Iron Man 2 loses not only plot coherence and villain quality, it completely throws away the good chemistry between its leads in favor of sniping, unpleasantness and a manic quality that makes it feel like a cocaine movie from the 70s.