I've only watched a few episodes so far and I continue to be impressed by the way it looks. It's almost a shame it isn't widescreen because it's really nice to look at. That said, just like with TOS-R, sometimes the higher resolution reveals things that undermine the suspension of disbelief. Not much, mind you, but it's there.
Originally I had purchased only the first four seasons of TNG because I didn't care for the rest. I'll eventually replace those four seasons with these enhanced sets, but I still won't bother with the rest. Enhanced imagery still won't interest me in those seasons.