Arc Fatigue: By Season 5, the viewers were so tired of all the mystery building up that the author decided to drop it all once in one episode: Evan confessed everything and Tucker and Hunter took care of Sam in an Anti-Climax, so we could get direct to the wedding.
Chickification: Dani in season 6 gets turned into a bland stepford mom.
From the miniarc in Season 4, where all the Stalker with a Crush from their group. Sam wants to force Tucker to marry her at gunpoint and Roxy manages to also capture Kyle and force him to make out with her. Just one problem: Both of them left the gun unnatended, giving Chelsea and Hunter plenty of time to figure this out and Chelsea takes the oportunity to reach for it.
Goes even more stupid when just now they all realize the gun doesn't have bullets to begin with. So Chelsea begins to beat the crap out of Sam. Problem? What was Roxy doing during this? Also... Why are Tucker and Kyle, untied at this point, only cheering for Chelsea instead of DOING SOMETHING ELSE??
Taylor has a lot of hate, and surprisingly enough, she has avoided being a major threat in all the seasons despite being the stereotypical Alpha Bitch.
For some of the viewers, also Chelsea is this. She keeps complaintning online about having a terrible life, has selfsteem issues and overreacts for everything, despite having a relatively wealthy environment, good friends, two hot boys in love with her and good grades.
Ryan also has a lot of dumbass moments, where one wonders if he is really being an Innocent Bigot or really a jerk. Many of the commenters consider he doesn't deserve Candace ( specially after he responded with a "by ME?" when she announced her pregnancy)
Evan. The guy is a loner who attempted suicide. Even the characters are sorry for him, being his first visitors at home, and they had the intention of kicking his ass at first because he tried to kiss Chelsea in a photobooth.
Dani. Her mother made her abort the baby she was going to have with Bryce and she is always cheerful with all the pain deep inside.