My thing, at this point in time anyway, is that (from what little I've seen) the character just looks so over-designed. It looks like they've lost Isaac under the make-up, and I don't think it was necessary to.
But then, it's still early days, and a better look at the character lies ahead, so we'll see...
It's the purple. If he looked more blue or gray in that scene there wouldn't be as much comparisons (although maybe he would've been compared to Malekith).I don't think it's only the nose/chin which is getting the Ivan Ooze comparision, I think it's more the color, which is too bright and blue/purple. But it could be just the footage.
I don't know blue or bluish looking Apocalypse has some precedence before the movie:I don't mind the voice and the height, those will probably be altered. Why in gods name is he blue? His armor was always blue but the guy had black/brown/grey skin. Why does he look like a like smurf on steroids? Come on, Singer!
Costume is great, head is awful, doesn't resemble Apocalypse in the slightest, doesn't even have his famous lips!