Season 2 is mostly a retread and where character derailment begins, hence why it is not as liked. The Duncan cheating arc began here, which brought down every character involved as Gwen became an asshole, Trent became unnecessarily weird, Courtney an even bigger bitch and Duncan a wannabe bad boy. If I am not mistaken, no one on the writing staff wanted Duncan and Gwen to be a couple, but corporate forced it as they saw two goth characters and went from there. This would explain why that plot line was so poorly handled.
The season also made Leshawna overbearing and Owen a jerk as he was some spy for plant for Chris or something.
Other issues with season 2 came from the lack of a clear antagonist or protagonists. The first half wanted Justin to be the new Heather, but he sucks, so that role went to Courtney half-way through. Neither one could compare to Heather or Alejandro. As for protags, Gwen and Owen were great in Island, while season 2 had Duncan and Beth, with only one of the two feeling like they deserved a finalist position.
The good of season 2 was that it started Heather’s redemption, gave DJ a fun relationship with Chef. The movie gimmick was also interesting. Otherwise, it feels like a poor version of season 1 that left no developments outside of Gwuncan, hence why it seems so insignificant.