I thought it was a very good followup to the original episode with Apollo. I swear that James Doohan has come back to life through his son. Scotty lives!
The only thing that bothered me was Kirk kept having meetings with his senior staff trying to come to a "consensus" as to what to do with Apollo. He actually took a vote?? What? The Kirk I knew would ask for suggestions but would never "command by vote." It made him look weak in my opinion.
The sets, props, etc. were outstanding (although a bit wobbly in some scenes) - it really felt like a true episode of TOS!