I agree on Pulaski. She could have been a great character if she had more than one season.

I don't think there's a truly great episode in TNG's first two seasons, though. They range from "utter garbage" to "fine" . Season three is massive improvement. Watching it back to back, it's almost jarring how much better it gets. Barely seems like the same show.

DS9 ranges from "I'll watch it, I guess" to "holy shit this is amazing". Kai Winn is a fantastic villain straight away, and would be the most talked about villain in any other show. The only reason she isn't is because there are so many great villains in DS9 that she gets lost.