Saw the whole episode in one sitting and was pleasantly surprised that the story is really tight, engaging and dramatic in the best way. I found it a worthy heir to the best of TOS.
In a way, Tressaurian Intersection seems to be a mixture of the Doomsday Machine and Wrath of Khan: a sister ship dismantled and gutted by an overwhelming force, its Captain dead or soon-to-be...The prototype and what it does to the star is akin to the Genesis device, and the episode ends with Richards/Spock running from the bridge to the transporter room/engineering to save the ship, sacrificing her/his life for the others. The ship barely escapes a cosmic-level Armageddon at the last second, with the Captain told about the tragedy...
One thing that came to me some time ago about the cast of this series: in a way, they are the Anti-Star Trek : You have Kirk who is charming, gregarious, laidback...then you have Garrovick who can be surly, uptight and hotheaded. Bones is cranky but also a southern gentleman, while Cutty can be blue-collar pragmatic. McCoy has bedside manner to spare but his other alter ego, Azato is a bone fide misanthrope.
Spock is reserved, dignified and intellectual to the point of arrogance. Harris seems to play these qualities up to a point, B'Fuselek as the alien standardbearer is easily agitated and pretty clueless...
Anyhoo, I don't really have anything to quibble about, save that the Doctor's casualty list seems incomplete: It mentions Ensign Richards, the security guy who got vaporized by the two invading Tressaurians, and the brig officer whose neck was snapped by the escaping Tressaurian...But what about the redshirt who was, I assume, killed just outside the transporter room (whose phaser is appropriated by Richards), as well as the two transporter technicians (we see one's limp body lying against the transporter platform)?
Favorite scene in this episode? If I had to choose, it would be in the conference room as Richards cluelessly goes on and on about Garrovick's personal history, and everybody's reactions (Cutty, Azato and the helmsman) as they just know what the Captain's reaction is going to be...Priceless!!