Wrath of Khan is a bad film IMO. I don't get why so many people like it. It's has no depth ST should have.
I still think the first ST movie is by far the best and one of the best sci-fi films ever, maybe the best one. It's a complex work of art with great visuals and music and more importantly it's really intellectual and it even goes behind the lines of mysticism, it has great pure sci-fi plot i.e. encounter with unknown extraterrestrial intelligence, great dialogues and characters, nobody has to run somewhere or shoot somebody to make it more interesting! In a fact there's no need for any action or jokes or explicit love story or similar things that
has to be in every big budget film 
... It's pure intellectual movie and I love that.
Wrath of Khan is kind of joke in comparison to 1979 ST, yet people love it much more...