it seems like the naysayers want a lighter skinned Storm... or even one with white features but darker skin...
Frankly, i'd strongly implore a De-pluralization of that statement as there is only one user here who fits the classification in its entirety, the other that you presumptively bundled him with wants nothing of the sort. And aggro isn't even the intent here.
Colorism issues aside, Lupita lacks the standard idiosyncratic Storm factor that a potential candidate for the big-screen edition should have. As far as i've seen, the masses have been so starved and pressed for a better rendition of Ororo in the movies that they've unanimously placed Halle's acting skills on the burner (despite the fact that i think she did a good job with the material she had access to) and are suddenly hoping the latest dark-skinned mainstream 'it' girl is miraculously going to bring us all to the promise land that we've so much yearned for. Uh, no. Piss poor representation will only ever stop after Singer reads Claremont's X-Men in its entirety and dissects the characters for what they are at their core in order to invoke and truthfully convey truer understanding, and since that's not going to happen, it's better to settle for what we have which is the character even making it onto the big screen.
Ontop of that, as i have said before and am in complete agreement with jhazz here, she looks absolutely nothing like Ororo. I see no resemblance, no shared nuance or evident trademark qualities. Where Ororo invokes and commands respect, obedience, power and subjugation, Lupita contrasts that with fresh-faced adoration and "awww she so pretty O.O".