To me it is quite the opposite. The shiny new 21st century CGI effects clash so much with everything around them that it yanks me right out of the story because it is so jarring.
But honestly, if people get pulled out of stories by shoddy FX, then perhaps they shouldn't be watching 40 year old low budget SciFi TV shows.
And a true "remastering"--which I would have welcomed-- wouldn't have added any new elements to the episodes, merely enhanced what was already there.
The Sci-Fi Channel already did that kind of "remaster" back in the 90's.
I like the CBS-D remaster, but I think the FX could have been more TOS looking -- or rather more 60's looking -- like Daren Dochterman's attempt at Doomsday Machine. I still would have added/changed things though here and there...
The Sci-fi Channel never remastered any Trek episodes.
The Sci-Fi Channel showed each original series episode over the course of a 90 minute time block so they could show the shows without syndication cuts.
The result was quite bizarre. With commercial breaks appearing in the oddest places.
In the case of "The Doomsday Machine" they cut to a final series of commercials as Sulu was doing his countdown of the Constellation plunging into the Planet Killer.
Um, yes...they did.
Granted they didn't redo the FX, but they went in and cleaned up the prints and all that. They made quite a big deal out of it at the time -- I don't see how you missed that point considering that was one of the big selling points of the broadcasts. They even had before and after shots on the commercials for it if memory serves.
This was back when they were running the short interviews during commercial breaks...