I saw the new X-men movie last night. And I will give you my two cents up front: It was awesome. The futures were dayed in the past and the days were past in the futures. I think some pasts even futured the days. There was a lot of future past days. If any of those sentences were confusing to you yet you're still reading, you will probably enjoy this movie. Because this movie is confusing. If you are a super comic meganerd and have read all the X-mans, then you will get this movie absolutely fine. If you've seen all the X-mans movies up till this one, most of it will make sense, but you won't get the finer details -- of which there are A LOT.
This movie is made for comics lovers. I found it totally enjoyable without knowing everything (I have actually not read the comic this is based off of -- I'm just surrounded by people who have) but I was getting a lot of the references second-hand from my friends after the movie ended. Particularly, that Magneto has children, Quicksilver being one of them. His perfect scene happens, and it's perfect. The entire theatre was laughing. Quicksilver, his mission accomplished and his powers too vast for the rest of the plot to deal with, goes home and watches some tv while the movie continues. This scene is pretty much emblematic of the movie itself: It's awesome, you will laugh, but we're here to move the plot forwards. Anything that isn't useful, or is too useful will be tossed aside. Singer's here to bring us some action scenes, to retcon X3, and to make all the references and jokes that you were really looking for.
This movie is about our core heroes -- Wolverine, Magneto, Professor X and Mystique. If you don't think Mystique belongs there then you are wrong. Everyone else makes an appearance, from a small and large. I haven't read the comic, and I know some people are really nostalgic, so if its not like the comic you could easily be disappointed by how it went and who showed up. Everyone I personally know loved the new Sentinels. They're pretty scary looking. Mostly because they're not as goofy as the originals. (Don't worry tho, you'll get your purple robots)
Let me be clear: This is not the best X-Men movie. That is still X2, followed by X1. This is third, by my book. A little better than First Class, but very much in that vein. Besides an awkward intro scene and some very limited lines for Patrick Stewart, I think the writing of the movie is fairly clean, if punny at times. In the end, if you have super high expectations, you may be disappointed. If you go in fairly neutral, I think you'll be very well pleased. (And the end teaser is very exciting)