I expect to like it - I'm Catholic and the Pope liked it
(that's a joke, not a very funny one).
As I think Gibson will do a good job of it (he has basically staked his directing career on it), I expect that people watching the movie will fall into three loose categories:
- believe in the message, love the movie, find it very moving
- treat the movie as a historical piece, enjoy the movie, find it moving
- hate the message, can't really get past that, and dislike the movie
If Gibson has done a crappy job, all bets are off!