My problem isn't so much with the show itself, but that
Enterprise didn't feel like
Star Trek. The aesthetic was that of a NASA spacecraft with dozens and dozens of switches, buttons, and displays covering the walls and messy wires hanging from the ceiling, solely devoted to exploration; as opposed a homely mobile cruise ship that was so advanced it could do anything and could compartmentalize all of it's machinery behind the walls in a way you hardly even notice you were on a ship if it wasn't for the big windows everywhere. The ship hierarchy acted more as a strict military division as opposed the laid back and flexible family of the previous ST series. The stories - like some of DS9 and all of Voyager - were rehashes of the plots ToS experimented with and TNG perfected. The one thing I will give Enterprise credit for, was the season 3 Xindi plot; it was the first time Star Trek did something original since the Dominion War, except the entire season was dedicated to it instead of it being a recurring episode plot. But that's the problem; at that point, Enterprise ceased being the adventurous, eye opening Star Trek series we had come to know about racism,
Your Terrorists are Our Freedom Fighters, and family aesops and instead became a stereotypical war plot about alien seals committing acts of space terrorism because of reasons as an excuse for action.
The characters were generally uninteresting; the only memorable character I can specifically recall was... um... well... my point exactly.
IMO, Enterprise felt more like a alternative show to then simultaneously running Battlestar Galactica as opposed to more Star Trek material.