Went to see X-Men First Class today.
I'd give it an A- overall. Pretty good watch... and it gave some good backstory on Professor X and Magneto. The team members themselves were a bit "underutilized" although they did focus somewhat on "fleshing out" Beast's character.
I was entertained throughout the movie, however I can't quite give it "best X man" honors but it was most certainly good. I'd recommend that folks go see it, but don't stay for stuff after the credits because there were no "Easter eggs" there (kinda disappointed that they didn't give us... something in that regard.)