No heart, no soul, no guts
I like TNG, TOS, and the TOS movies, but this just felt like the worst possible mishmash of the three.
The story would have worked better if the entire TOS crew was in it, and there were a real passing of the torch where the two ships and their crews meet. If not that, then the story should have involved just Kirk and Spock together in substantial roles, where the two of them are somehow aboard the Enterprise-D and help save the world one more time alongside Picard and company, and gracefully step aside when their work is done (without hogging the spotlight or making the TNG cast look inferior).
It just felt like a bad and rushed episode of TNG guest starring Shatner playing a Kirk-like character and not Kirk himself.
And one more thing... seriously... Checkov and Scotty? To me, they are my two least favorite characters. They're both walking stereotypes of their nationalities. Uhura and Sulu would have been better for the opening scene. At least I can take them seriously.