I agree with Psylockolussus, JL granted commercial success but her character is weak. She reveals too much in her acting and it just doesn't feel like Mystique to me at all (this is personal).
Physically JL doesn't seem so strong either. She rushes, which makes her character lose the coolness that RR illustrated in the OT. For example, in Trask's office, when she went up the stairs, she was jumping the stairs. If you recap how RR entered Stryker's office in X2, it's way better, more like "I'm the master of the situation" rather than "I'm sneaking in to steal something".
RR's walk tells a story, I don't have to add anything.
RR's makeup was flawless, she looked real whereas JL looked as if she had jumped into a pool of paint or something. And the transformation effect of Mystique in the OT was way better, you don't see a gap between the blue scales and the body like in DOFP or FC. It's so fake. I do hope that JL's out after Apocalypse