I voted "TNG was okay, I have no strong feelings"
I think a lot of times TNG does get preachy, and a few of the characters really do nothing for me. It's difficult to think TNG is excellent as a whole when I find some of the main cast just there rather than anything exciting. I don't mind episodes themselves but sometimes just the entire tone just doesn't do much for me.
It's ok, some episodes are decent, but there's a lot of stuff which isn't particularly excellent but just "stuff happened... nothing eventful we moved to a new planet and now we're not going to talk about it anymore."