My overall impression is the writers/producers/editors knew which couples were going to end up together, but not exactly how they would get there. A LOT of the show seemed improvised, which in my opinion is where First and Khaotung shine through. As much as I genuinely love Force and Book (and I adored A Boss and A Babe, I rewatch and bought the DVD), I don't think they had as much chemistry or coherence in their pairing. As they got together it felt like a competition, then a lot of declaring "I love you" without actually showing what made them fall in love? They have cute dates and cute scenes but in the end it didn't feel believable to me.
I thought the show was trying to make Neo and Mark layered characters, but in the end I don't think Neo's character had any real growth or understanding of what he was doing that alienated people. Mark was fantastic, I am begging GMMTV to give him a lead role again.