I saw this by random chance yesterday.
This movie has some nice ideas, I really like the "War Lord" character, first of all, it set up a nice bit of story post the first movie, that I had not considered, and is not about Earth uniting around tech reversed engineered from the alien craft. The problem with him, after some nice set up he was underused, and whilst setting up that he kills without fancy guns, in the end they give him a gun, I would have loved to have seen him (and a team) take on some alien close quarters hand to hand.
Away from that moan, the science is worst than the first, whilst I loved the massive scale of everything, enjoying it soon leads to wondering how a ship can sit on 1/5th of the Earth and the rest of the earth have sun light, not clouded over, not to mention the effects of the ocean drilling was ignored.
The characters aside from the War Lord are ok, at the start they can be tiresome, but actually when the action starts they are tolerable, and then at the end they flip a switch back, and I remember that they annoy me.
I did enjoy the alt timeline nature, seeing how the world has changed, the building of the weapon on the moon is some nice sci-fi where you can just sit back and watch humanity seemingly at its best.
Finally my biggest problem is the aliens plan, had failure written on it from the start, if it all stops when the Queen dies, why on Earth, does she ever leave the massive ship that Earth has no hope of defeating, because her ship is something we can defeat, with the level of tech seen, then she leaves for an even smaller ship, leaving her giant ship was just dumb on her part.
For the future there is no question there is scope for a sequel, one focused a bit more on Data, who I think was gay in this movie, seemed a bit out of no where, but it was a nice moment, in a movie with characters who were more often that annoying, or interesting but poorly used.