Hey, what are your top five favorite episodes? I am not going to rewatch the series again, just the really good episodes 
I couldn't limit myself to 5, here's a bunch of my favorites randomly picked:
Balance of Terror
The Doomsday Machine
Amok Time
The Devil In The Dark
Obsession
The Trouble with Tribbles
Assignment Earth
The City On The Edge Of Forever
Space Seed
Court Martial
The Menagerie
Oh, and I mean of TOS. I have only gotten to episode 2 of TNG.
Don't get discouraged, some of those first season episodes stink real bad, but it improves drastically in season 2.