Well, when people offer the same criticisms over and over again, it does get pretty boring (
ON EDIT: so does making the criticism all about
you
).
Regarding the effects, I thought they were superb. I esp, liked how the Kongo was shown to veer to port as shown from behind and between the nacelles after Lara ordered to disengage the two Enterprise parts and the Romulan ship in Part II, a copy of a stock Enterprise library shot from TOS. I also liked the large interior hall shots at Starfleet HQ, which evoked the rec deck in TMP. The spacedock scene was well done in my opinion, and I really like how the Earth was depicted "color-wise", which looked very much like it did in TMP. The guy in the spacesuit was another TMP call-out of course, which I had no problem with.
Overall, I really liked the blending of effects, uniforms and interiors between the TOS and TMP eras. The difference in production design between the two era was jarring in 1979, but somehow the finale was able to blend components of each in a way that made the transition seem plausible. Arguably, it is the more modern overall CGI effects aesthetic in STC that allowed for that.
As for script contrivances, I pointed out one that really bothered me in the now locked thread. But what else is new? In TMP, the only Starship in interception range of an intruder cloud threatening Earth was a ship undergoing refit in orbit?! In STIV, how convenient was it that Kirk and crew would be given a chance to save the world on their way back to face the music over their actions in the previous film? And as for Kirk not acting like himself...which self? There's the hardass "not on my ship, mister" Kirk, the melancholy WOK Kirk, the insubordinate rules breaking caricature Kirk in STIII, etc. etc.
I don't hold a fan production to any higher standard than I hold "cannon" Trek. Sure, it wasn't perfect, but the conclusion of STC was engaging and emotional and just plain fun, and that's enough for me to appreciate it for what is.
That's all I have to say about that.