I've never had any problems with the remastered effects in TOS. In fact, in many cases they are an improvement over the original IMO. For example, I love the scene where the
Enterprise flies extremely close to the sun in Tomorrow is Yesterday. That is sooooo freakin' cool! About the only effect I saw no reason for remastering is the Zetars in my fave episode, The Lights of Zetar. I think the original was better. The lights look very blurred in the newer version.
I default to the CGI fx, but there are some episodes where I'll opt for the originals on Bluray:
-
Where No Man has Gone Before: I'll watch either version, but with the original you get the film dissolve near the end, from Kirk to the Enterprise. And the very early fx carry a certain charm or nostalgia (although I prefer CGI for
Charlie X, which I think they improved a lot by showing the freighter).
-
The Alternative Factor: the original has a single-use aft angle on the Enterprise firing phasers that's really cool.
-
The Immunity Syndrome: this one is a judgment call. The amoeba looks more real in the original, but more interactive in the CGI.
-
The Ultimate Computer: I'm not thrilled with the new battle fx; the ships are often too far away. The original has that cool "four starships" shot and, near the end, a nice close-up on the engineering hull that dissolves to McCoy.
-
The Tholian Web: they did it really well the first time. Won an award if I'm not mistaken.
-
The Enterprise Incident: putting a Bird of Prey in there makes it seem like revisionist history. As Kirk would say, "That's not the way it happened!"
-
Elaan of Troyius: the remaster wasn't done with sufficient time and care, while the original Klingon model still looks great.