TNG was pretty good, the others I could take or leave. I've seen every single episode of TNG multiple times (used to live with a girl who was obsessed with it).
But the main problem with it was that is was a bit mealy-mouthed. It was a bit Dawson's Creek half the time, and there wasn't nearly enough actual battling (cf Babylon 5). I think that overall that made the series weak. You never believed that they would just stand up and fight. Although Worf was a hard dude.
I did enjoy Nemesis, although I watched it on a plane, and therefore can't really comment (it was either that or 8Mile, which I'd already seen 6 times, or Analyze That, which I'd already seen twice).