What do you consider "good seats"?
Chances are most people will be in a rush to sit in the front rows, so if you prefer the back row, as long as you're not late, you should probably be okay.
I prefer the back seats, anyways -- you can see the whole screen comfortably, and since you're in the back, you won't have some douche kicking your seat or trying to use your head as a footrest.