You're always going to have ups and downs - if you look at the careers of a whole bunch of people I respect, some of them have good movies, some of them have bad movies. I remember Andrew Garfield said that the only power we really have as actors - or one of the main powers we have as actors - is our choices. We can make interesting choices, but as soon as you've made that choice, so much else is in play: the director, the script can change, the other actors. All you can do is try to make interesting choices and, once you're in it, just do the best you can.