I have noticed there is quite a bit of polarity in the reviews for this movie. In my opinion, if you have seen the other 2 X-Men movies, you will be dissapointed by this one. That being said, it still has entertainment value, just not what it had potential for. I thought the storyline seemed overly contrived and was quite different than I remember it in the comics, though I could be wrong. And dont bother staying for the end of the credits- you will be even more dissapointed...
I would actually give it about 3.5 stars if I could. I just didnt think it was nearly as good as the first one. The child actors seemed even more whiney and wimpering in this one. Also, if you havent read the books, there is a good deal of background info that is just assumed you know about which makes it a bit confusing. All that being said, it does have its high points. Definitely worth seeing.