All of this.T'Pol's addiction didn't make any sense. It was supposed to help her experience emotions? Did they forget she's a TOUCH TELEPATH? She was already getting that from doing neuropressure on Trip. It didn't just cheapen her, Phlox was negligent for letting her back on duty so fast.
Phlox I can handwave as they were in the middle of an emergency with one-fourth of the crew dead. They needed all the able bodied people they could get who weren't physically damaged. It happens a lot in war.
Story wise, tying her emotional journey so tightly around Trip did her not the pairing any favours. I don't say that to kick up the remnants of the decade-old hornet's nest, but it always came across to me as a lazy way to get them together, and that was crap that didn't need to be added to make that happen or plausible for the fans that already supported the couple.
And then Harbinger was, to put it mildly, a letdown. Brian Setzer was a guest judge on American Idol at the same time and I was REALLY livid that I skipped that for this episode. 

