Thor Kinda Sucked, there wasn't anything interesting to go on in the first place, hell Thor as the character kinda sucks being the not-so this or that.
X-Men First Class... I wanna say I love it, I REALLY do, but there was alot of stupid shit forced into the movie to really enjoy it, I'll give a good example...
Magneto at the last act, boy this pisses me off on many occasions. not only did he do a 180 for no reason, at that point he also somehow completely master his powers.
I call major Bullshits on that.
Plus every scene with Kevin Bacon made me laugh on how goofy that shit was.
everything else in the movie was really enjoyable though, there were more sweet spots than sour ones, but boy the sour ones were bad.
Captain America was a perfect superhero movie where it balances the goofyness and the serious parts in the right proportions, every actor took thier role seriously and had fun with it as well. I expect the new spiderman to have this formula.