Enterprise was hit and miss for me. I adored the first season, but during the second season, I kinda wandered away. There were a hell of a lot of bad episodes in the second season. I returned for the third season, and fell in love again. The fourth season was just f*cking awesome.
Now, I do have lots of issues with the show. Since I've been working my way through the series again recently, those issues are fresh in my mind.
Characters:
Mayweather: I think Keckler over at TWOP said it best in her Twilight recap when she wrote "On the Bridge, Cpt. T'Pol crouches next to a fallen May-Dead-Again. He looks pretty dead. Again. This fails to answer the question: how many times can you "kill" a character before you finally fire him?" I mean, seriously....what was the point of the Mayweather character after the first few episodes of Season 1? They never, EVER utilized him except to kill him in alternate realities. Even in IAMD 2 he was simply relegated to Empress Sato's bitch.
T'Pol: I'm sorry to all the T'Pol lovers out there, but I just did not like the direction the character went. Why did she have to explore her emotions? Why did she have to become a crack whore? There are no good answers to these questions, except they wanted her to hook with with either Archer or Trip, and in B&B's warped minds, the only way they could do that would be to give her emotions. We could have had a very dignified character who got accustomed to living amongst humans. We still could have had her help Trip though his sister's death....thus forming a bond, etc. etc. etc. They didn't have to throw emotions at a Vulcan. The relationship still could have worked. It's been done. Sarek and Amanda? Hello?
Archer: Okay, I love Scott Bakula. I loved him in almost everything he's ever done. However, during his 4 years on Enterprise, he never did learn to pull the stick out of his ass.
Plots
Temporal Cold War: Oh, God. I could go on and on and ON about how dumb this idea was. I could spend hours going over all the reasons why this idea never would have worked, no matter who was writing it. However, all I'll say is this: 3 f*cking years and we still didn't find out who Evil Future Guy was. That pissed me off.
With all that being said, Enterprise was fun. It had it's ups and downs, but all shows do. God, I could barely get through the 7th season of TNG or most of Voyager. You had to take the good with the bad, and for the most part, the good of ENT outweighed the bad.