I just finished watching the three seasons of ST: TOS, and here are my thoughts/comments on the show.

I love Spock. Nimoy is definately the man! =D

The interaction between Kirk-Spock-McCoy is the best/strongest aspect of the series. I don't think the show would have been half as good without them all playing off of one another.

The first season is the strongest season. Maybe the scope seemed bigger, or the character interplay was at its strongest, but the subsequent seasons - especially the third - seemed to be missing a certain spark.

I like how the writers, even with a limited budget/effects, managed to create some really alien aliens on the show. Sure, they were overshadowed by the human/rubber forehead aliens, but I'm glad to see the creators make some effort toward bringing the truly incredible to life.

I wish Grace Lee Whitney had been on the show longer.

Without this show, my favourite scene from The Cable Guy would have never existed.

I think too many episodes were focused on Kirk and his love interest of the week to the detriment of other characters who deserved more exposure/development, like Uhura.

Pretty much all the episodes that focused on Earth-parallel cultures - with the exception of "Miri" - were all bland and only served to draw attention to the show's weakest aspect (the all-too-human aliens).

I think full-blooded Vulcans/Romulans should have been made to look more alien so as to distinguish them from Spock more.

I thought the Starfleet uniforms looked cheap and more effort should have been put into designing them.

I know it wasn't commonplace back in the 60's, but I would have liked to have seen some story/character arcs done on the show. It would have helped in the characterization department and made the show less formulaic.

I'm starting on TNG now. I'm two episodes in already, and so far I haven't seen anything all that interesting. It's too early to give up the ship yet, though, so I'll give it at least half a season before I decide whether or not to bother continuing with it.