I'd definitely rank Wrath of Khan first, but follow it up with Star Trek Motion Picture at number 2. The Motion Picture was such a good story with Vger. The insane sized "ship" they go through to reach Vger was cool. I still love it. Everything else is entertaining but Insurrection was horrible. WTF were they thinking?
Interesting choice! Like I wrote, I liked the V'ger idea. I thought some of the execution was off, and I thought the slow pace didn't work, but that was really a great idea. Yeah, Insurrection is terrible. Seems to me like it was time for a movie and even though they didn't have an idea, they felt they had to stick to the movie schedule, so they pulled out and dusted off this old script that was so bad it wasn't even picked for a TV episode back in the day.