Nemesis has a 'dark' visual aesthetic to it that I think gives it that darker feel but I dunno if I would really call it a dark film as such.
I'm happy enough with PG-13 for Trek in film but I do feel that most of the audience is sufficient for that rating to be pushed to it's boundaries from time to time.
The Undiscovered Country I liked more when I was younger. It's OK, but it's in the middle of the pack for me and has been for a while.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist