Saw it Friday night. Liked it.
Not a cure, a temporary solution. Supresses, but as we saw, won't last forever.
I don't see that as being a "then all this was for nothing" type of thing. Magneto has, in the words of Ricky Ricardo "A lot of 'splainin' to do" to Mystique and probably won't be as easily trusted by "the pawns".
I was more bothered by him being FREE and in the park at the end. This is a man who has killed a lot of people. They won't just let him run free because he's no longer a mutant.
Halle Berry was worthwhile in the film. Love the whole change-of-heart on her part. ("I'll never do another X-men movie again unless it's all about Storm" - followed by the whole Catwoman debacle...)
Agree that Xavier was far too powerful as given and that they're better off writing him out of the thing entirely. Very probably makes Berry more interested in sequels, as she's potentially got a beefier role in any future movies. Also makes me wonder about Patrick Stewart's health, as he's made some comments about being "too old" to do more Star Trek and so forth. Maybe it's kind of like Ron Glass' character being killed off in Serenity because of the actor's health.
I have NO PROBLEM with Rogue seeking the cure. If you're a horny teen and you can NEVER have intimate contact with anyone without risk of killing them, then the cure seems like the solution. Since WE know that it's not permanent, it, in meta-terms, gives her character the time to explore intimacy before ultimately regaining her powers. (Which aren't like Superman/Xavier/Magneto type powers anyway, folks.)