The main plot seems to get resolved, around halfway through with far too much time spent with the unwinding, like Return of the King but less interesting. And the final "reveal" was just putting to video what characters had already told us about over an hour ago in a concept that was obvious from the first five seconds of the movie.

But while the main plot felt like it was finished halfway through the movie, every other subplot - and there are quite a few - is left incomplete, the combination of the two gives the impression that the action is just going through a lull before it picks back up, but it never does, it just sorta ends.

[EDIT] Okay, so after thinking a bit more about it, it isn't really as bad as all that. It was really well done for the early and middle parts, it's just that the last portion soured me to the whole thing. I don't especially have a problem with the subplots being left unresolved, it's just that the movie goes on for so long after the main plot has ended that you start expecting something to happen with them.

So yeah, I would probably have said I liked it if it had ended earlier.