definitively not the best episode in season three, but no so bad.
trip/t'pol : very funny. t'pol jealousy was great. "she touched your behind"

. the discussion between them, during the vulcan neuro-pressure was hilarious. and the line : " i think i have to thank you", "no need to thank me" trip says with a big smile.
reed/hayes : since the beginning of the season, reed is very silly. in the first episode of the season, we understand that enterprise crew has all to learn with the maco. and reed is worried about the position he has on the ship. come on, guy, you are in mission to save earth!!! so i agree with you, broccoli, it's just so juvenile. at one moment, i have thought that trip had going to say that to him when they had lunch.
the third story : what third story??? no, i'm kidding, but i think that three stories in one episode is too much. anyway, i like this third story, which is very important for the rest of the season.
to sum up, i think the t'pol/trip story+the sphere builder story would have given a good episode : the story line with the sphere builder could have be more developped