With regards to STD, I...enjoyed it, sure there's some things that make me grind years off my molars, but there's one thing that really sticks out as being just plain bad.
The makeup of the Klingons.
I was watching this
https://www.youtube.com/watch?v=wFkZgxtlcwsAnd got to thinking. Now I love Babylon 5, but its one of those shows that when it comes to its digital effects has aged badly, but its makeup, especially after season 1 remains top notch. THe show's old now, but if you look at the Drazi, their faces are quite heavily made up with a fair bit of prosthesis on it, but they are able to emote fully and display a wide range of emotions. Why the hell all these years later, are the Klingons from STD as emotive as a desk chair compared to the Drazi which are what...20 odd years old now? Just what did the STD folks do wrong, was it a case of too much prosthesis to try make the Klingons look super different or was it something else?
Even in older shows like DS9 where you had folks with large amount of prosthesis like the Ferengi or the Cardassians, the were able to emote and move a damn sight better than the Klingons of STD did. Quark and co talked a LOT with their body language, and used hand gestures and arm movments to emphasise points and parts of their conversation that Italians would understand (although our Meditteranian friends can flag down planes with their arm movements :p ).
With Cardassians their heavy prosthesis was countered by some truly superb actors, Garak and Dukat were superb, and the makeup they were was thick but it still let them emote. Indeed, the most emotive thing about them was the actors who really sold the characters.
The STD Klingons on the other hand from the episodes I watched just tended to stand there, arms hanging at their sides and didn't even seem to use much body language, which was such an important part of DS9's Klingons who, again, were often very animated when they talked.
Another good one with heavy makeup was the Narn. They had big outfits on and everything but again, retained their expressiveness despite a lot of makeup and prosthesis
https://www.youtube.com/watch?v=7NsdQzoIXIEand some more closeups of Narm makeup. Of course this role was done by a SUPERB actor, and the power duet of Londo and G'kar was probably one of the best in the show but still, excellent scene and it shows the advantage of makeup and a small amount of prosthetics.
https://www.youtube.com/watch?v=A9v1jJ_ATec