I kind of enjoy "Unexpected." It's big problem is pacing -- way to slow to start, then accelerating too rapidly near the end. But I like the basic thinking behind giving Trip a male pregnancy story. The visuals for our aliens of the week are unusually well designed.
Plus it has that no-gravity shower scene for Archer! Reviewing the remaining options really underscores how often nothing else on Enterprise was working, and the only satisfying thing to hang onto was that hot men were regularly taking their clothes off. "Ugh, 'Acquisition', but at least it has Trip in his underwear for the first half... 'Desert Crossing', so stupid, but it does have that extended shirtless sporting montage..."
TERRA NOVA
ACQUISITION
DETAINED
DESERT CROSSING
TWO DAYS AND TWO NIGHTS