I truly did not like 12 Monkeys... it sounded so promising, but the execution was terrible and the final twist was rather poorly planned and barely justified by the plot. ...and it could have been such a great movie.
I have heard that a few times from friends as well actually. I don't get that. I found it was very well made, it's not sublime, but good enough to get me hooked more than once.
I enjoyed it so much I saw it 3 times over a few years. I agree, not the deepest or most intense plot but some great performances by actors I wouldn't normally have watched i.e. Brad Pitt, Bruce 'Die Hard' Willis and others. I will check out The Jacket too thanks