I can't believe I haven't added my list to this thread. My cringe factor usually goes off the scale during this lot.
5. Acquistion
At the top of my final five means I don't totally hate this. I saw nothing wrong with Ferengi showing up, and the origin of Vulcan Love Slave had to occur somewhere. My problem is something ENT suffered a lot with... making the crew look like complete idiots, even when they were just bluffing it.
4. The Crossing
I had high hopes for non-corporeal entities appearing on ENT and Observer Effect got right, what this dealt with in an immature way.
3. These are the Voyages...
I've wasted altogether too much time on this piece of character assassination frankly. The best thing that could happen is to canonize The Good That Men Do or make a TV Movie (#99 & #100) that rewrites what must have passed for a history lesson to Riker and Troi. If it is indeed, as the saying goes, written by the victors... then they obviously hate Enterprise. The insult added to injury continuing with Star Trek's "Prized Beagle" jab. Damn this cancellation stigma! Will the shame never end?
2. Rajiin
Ah yes, space vamp who swings both ways. That Xindi Reptillian attack couldn't arrive quick enough.
1. Precious Cargo
My all-time bottom episode, Archer's play-acting to make T'Pol look threatening is beyond painful to watch. Between that and Trip & Princess Fishsticks' escape, this is awful and has nothing to recommend it beyond the teaser, with Trip playing the harmonica and seeing a ship come alongside the window.
There are plenty moments in other episodes, particularly Season 1 & 2, but usually the good outweighs the bad and doesn't result in me storming out of the room, because the crew's reputation has taken a terminal beating.
I've made my peace with A Night in Sickbay and Archer has some genuinely decent moments with Phlox (both funny and touching), which distract from the stubborn prick he's behaving the rest of the time.