Apocalypse-He looks ok (and lets face it, his design has always been goofy). He's got that "pharaoh" thing going on with his head-piece which is a nice touch.
Storm-She looks great. As an unabashed fan of the Mohawk, the fact that they've made it looks so good makes me giddy. She seems to be wearing a more "classical" type of costume though (not a bad thing, merely making an observation).
Magneto-He looks great as well. It's the most "theatrical" costume that he's had in these films thus far.
Psylocke-It's weird, I love everything BUT the costume. Love the hair, the Katana, the purple psychic energy emitting from her hand, her pose, etc. But I always hated that costume. I've never subscribed to the "it's iconic/comic book accurate, therefore it's automatically good" line of thinking. It's a ridiculous (not in a good way) costume and the stuff that Munn has said about how it works makes me like it even less. And it's annoying that they finally decided to be more "accurate" and they pick THIS thing to do it with. Her current look, or her Uncanny X-Force one, would have been so much better.
Jubilee-She looks great, no complaints. I do wonder if she'll end up cutting her hair at some point, but we'll see.
Jean Grey-Obviously we haven't seen her costume yet, but her civilian look is pretty good.
Cyclops-Same thoughts as Jean.
Mystique-She looks ok. I like the shorter hair.
Archangel-He looks good. It'd be nice if he were blue, but it's not essential for me.
Nightcrawler-He looks good as well. I like the goofy jacket a lot actually.
Overall, things are looking pretty good so far.