I liked Iron Man 2 when I saw it because it really introduced us to the expanded MCU for the first time. I didn't mind that it meandered a bit, and I still don't. I think the only movie that didn't really appeal to me was Thor 2.
Yeah, like I said I still really enjoy Iron Man 2 and Thor 2, even if I acknowledge that they're weaker. Really, for me all the Marvel movies are great. honestly, Iron Man 3 is probably weaker than IM2 in my opinion, but IM2 seems to have a slightly worse reputation. I don't think that the MCU has a single bad movie, I like them all.