I'm definitely seeing this one, so I can't really look at the main post above. But the non-spoilery opinion summary is pretty disheartening. I guess I'll have to decide for myself when I see it for myself.

I'd expected rather more from this one because of Shane Black's involvement. His film "Kiss Kiss Bang Bang" (also starring Robert Downey Jnr.) was both exciting and hilarious, so he seemed perfectly suited to direct an Iron Man movie.