II, IV, and VI are all worth a watch. They are a good movie, an entertaining movie, and a surprisingly good movie respectively.
I'll watch the odd numbered ones as well but I'm a fan and I know I is too long, III is mostly not good, and I enjoy V for its craziness.
Who thought it is a good idea to let George Lucas edit Trek? It's like an Odo shot first kind of situation. And I think Odo never used a phaser.
Is this is the guy that Scotty shoots in the end? If so, I've only ever seen the version with that scene and the bad Mission: Impossible face mask reveal. And I owned this movie as a VHS bought in Europe as part of a set released before VII came out...