I wish that Marvel would have gone with a more focused look into the Phoenix Force. Jean Grey was supposed to be an omega level mutant, with nearly unstoppable power, but this show really downplayed her ability to the point where she is helpless.
The show also went with an attempt to have a softer Wolverine and lessen his role over all. He should have been a total bad a$$ and kicked some too. They also had Professor X in a lesser role, he is supposed to be one of the best physic mind in the Marvel World, but he was constantly failing to live up to what the fans expected.
I do like the design of Mystique, it seemed like at every turn she had a hand in it. But not so great with the development of Magneto, his abilities were horrible considering what was in the last X-Men show.
This show was really rushed, and if given time and the right direction it could have been a great show. The art was leagues better then the preceding one, and the character designs were good. But as with most remakes, there is always something missing.