Figures this would turn mostly into a continuity argument.
In the trailers they used actual footage from the earlier movies. Hugh Jackman is in it. Clearly it's not a reboot. And just as clearly, we're not supposed to pore over the minutia that are the continuity errors between the films. Seriously, just don't think too hard about it and it's ok.
Didn't mind the movie. I thought the guy playing Xavier was pleasantly charismatic. I could take or leave the plot, character choices, etc. Shaw was an excellent villain, didn't think they used enough of him absorbing the nuclear reactor. Good music, may purchase the soundtrack.