She was great in X-Men: First Class. Best X-Men yet, IMO. Michael Fassbender really stole the show. I could watch that man take revenge on Nazis all day and never get bored. The entire cast was very solid though. It led to some surprisingly poignant moments.
Jennifer Lawrence is young and can truly act. It is uncommon to see such a young actor play a nuanced role which carries the greater weight of a film. A beautifully painful film. Hit close to home for better and worse.
Best thing about the movie: they Broke the Nazi German Rule.
In most American films dealing with the holocaust, the low level soldiers and whatnot bark out orders in German, the Jews don't speak German, not even with an accent, and the "evil" overlord Nazis speak English with a bad German accent.
In this films, even the Jews spoke German. Every German did.
The fact that a Hollywood Blockbuster film used three non English languages in it, German being one that carried a lot of the back story gets congrats.
And frankly (there is a really bad pun to be made there), I am pretty much sick of holocaustporn. Oddly enough, this film didn't go that route.
The film could've been cut 20 minutes shorter easily. Professor X is even more annoying as a young man than later.
But all and all it was an OK action, superhero film. But as said above Magneto's backstory and charater development(?!) and Fassbender's acting actually was treated quite well, not just for a comic book. Over the top, but more nuanced than Spielberg's schlock.
There is a line toward the end of the movie that is a cliche you've been waiting for the whole film and it doesn't ring cliche at all.
Amazing what a single real actor can do for a film a little think on script and supporting acting.
You are right Jennifer Lawrence did a great job with the lines she was given.