TOS was what it was. Some episodes were better (and aged better) than others. After a pretty week start, TNG was pretty solid. DS9 was good too far more often than not. While other series had their strong points, I'm not going to go to the mat to defend any of them.

No love for VOY? :)

I know it's been a long time...

There were definitely some good episodes and it probably got better over time. I'd probably give it a mild thumbs up overall with reservations.

The overall Star Trek experience since DS9 feels like:

Fans: "The last series was the worst ever!"

Star Trek producers: "Hold my beer..."

Fans: "You know, the old series weren't so bad in retrospect."