I'm a bit biased (at least I'm upfront about it) being a Marvel comics fan but I absolutely thought this was one of the best movies so far this summer. Hands down. I say that after seeing Thor, which I also thought was great but X-Men: First Class blows it away. I can only hope that Captain America is just as good. Acting, plot, effects, were "First Class" pun intended. Enjoy!
Not much more to say except the hits keep coming for Marvel. It had a bit for everyone, romance, action and adventure. 3D isn't necessary unless it's "your thing".