In my opinion...
None of them are any where as good as the TV series.
is probably the "best" but 17 years later I still think Picard is totally out of character that movie. Insurrection
probably feels closest to the TV series in terms of characterisation but the plot is lame. Generations
is entertaining but doesnt make a lick of sense and I actually though Nemesis
was okay in the theatre but in repeat viewings it just makes me angry. It really is the worst movie out of all the 12 in hindsight. Somewhere there is a average movie trying to break out, but the director killed it.
Truthfully, the TOS movies are better than the TNG ones.