Everything about the film would have been forgivable if Data hadn't been killed off.
Data's death (and the inclusion of B4) does
rather have the feeling of being "one ingredient too many", doesn't it? What Nemesis truly needed to be was a top core political thriller, but all the mucking about, trying to make consessions to Brent Spiner's ego, unfortunately meant that it got weighed down with a subplot that was counter-intuitive to the main plot.
an apologist for Nemesis, though. I don't think there's anything in particular about the movie which couldn't be fixed with a substantive re-edit.