I wasn't a great fan of the Rand story. I love the character and was pleased to see her get more than one frame in the transporter room but the story didn't ring true on a lot of levels.
Yeah, it's got some nice ideas in it with the aliens who can cope with intergalactic travel, but the whole idea that Rand would manage a relationship with something so different that would also require her to renounce all human contact for the rest of her life even though her beloved is going to be plugged into a spaceship so they'll never properly be together anyway... Well maybe it could be done convincingly but not in the page count required. And her dumping him at the end when he's now mentally damaged makes the whole relationship seem even more insubstantial.
I found the best issue to be the Joanna one, as someone said upthread, the idea of her dating a Vulcan is genius, and Spock and McCoy have a lovely moment at the end.