When ever a sequel of a hit move is released people have high expectations from it. Same was with the case of X men. But X-Men: Days of Future Past was not able to rise upto that expectations.
The movie is a big commotion, and the major thing about x men series is that it could not be called a sequel as there is no continuity whatsoever. Earlier also X men First class was a total commotion. But still it was a success. But Days of future past is not what the audience expected. The movie features a reign of robots that adjust to the fighting powers of mutants and to kill those robots wolverine is being sent into past to re write the future.
All in all the story and plot do not quite click with me.