Hmm. Here are some of my favourite ones:
Extreme Measures - particularly fresh in my head after my DS9 rewatch, this is a totally botched episode in the Section 31 arc, and undermined any sort of antagonism that was there previously.
The Search, Part II - whilst Odo discovering about his people was fascinating, finding out that everything else that was happening in the episode wasn't happening was such a dull end.
Fury - I was looking forward to Kes coming back, yet this poor effort made me wonder why they bothered.
Shockwave, Part II - a very dull follow-up to what was a very exciting cliffhanger. Oh and the gazelle speech Archer makes at the end was awful.
Birthright, Part II - so the most interesting part of the first half (Data dreaming) actually finished in part one. All we have here is the dull Worf story.
Extreme Measures - particularly fresh in my head after my DS9 rewatch, this is a totally botched episode in the Section 31 arc, and undermined any sort of antagonism that was there previously.
The Search, Part II - whilst Odo discovering about his people was fascinating, finding out that everything else that was happening in the episode wasn't happening was such a dull end.
Fury - I was looking forward to Kes coming back, yet this poor effort made me wonder why they bothered.
Shockwave, Part II - a very dull follow-up to what was a very exciting cliffhanger. Oh and the gazelle speech Archer makes at the end was awful.
Birthright, Part II - so the most interesting part of the first half (Data dreaming) actually finished in part one. All we have here is the dull Worf story.