Midnight Black, I believe you've made an unfair review of Lawrence's performances. All films consist of actors reading lines, and JL's Katniss was able to do so with a very present set of very subdued emotions. There was a reason her outbursts didn't seem to come from nowhere, because she had communicated a complex character effectively, wordlessly. Her X-Men role was simpler, and less a show of ability rather than role playing, but they show her to be a top-notch actress.
Taking this in concert with Silver Lining's and Winter's Bone shows that she is overwhelmingly likely to do a good job with the roles she's given, with the demonstrated potential to do an incredibly outstanding job.
Now don't misunderstand me, this is not to say that Jennifer Lawrence should be Wonder Woman, but I do want to be clear that acting is a skill, which can be demonstrated and observed, not a crapshoot which is more dependent on looks than on experience.
I understand your idea about disappearing into the character... but disappearing into the character doesn't mean anything to me, if you aren't able to bring the character to life as effectively as someone else. This is why character actors don't headline big blockbuster films, not because character actors aren't important in building a world, but because the primary goal in getting people to love a movie is communication, not disappearing.
