I actually thought this season had a little string of pretty solid episodes from Dynamic Duets up to Sectionals. I actually liked Finn directing New Directions. I'm not Finn's biggest fan (and while they made him take one step forward and two steps back by suddenly turning into a mob enforcer on Brody....and having "independent diva" Rachel find it dashing, like a damsel in distress in a fairy tale castle), but he ran ND better than Will (hell, Blaine and Sam ran it better than Will), not to mention acted like twice the adult in the whole Emmagate fiasco.
Even the Grease episodes weren't bad, and the Christmas episode was better than the ones they've done before. The Break-Up was pretty well-done, despite what I find as the contrived cheating plot line, and the phone call between Kurt and Blaine on Thanksgiving was easily one of the best-acted scenes of the season. Ryder is much better than the other Glee Project characters and Blake Jenner is a better actor.
It was after Christmas when stuff really got stupid, with Brody getting thrown under the bus, introducing Adam when they never lifted a finger to even pretend to actually care about him, having Blaine crush on Sam and Tina crush on Blaine, etc.
And then the double whammy of two "Very Special Episodes", one PSA about school shootings, and one about child molestation (brought up in one episode and never mentioned again). Just further evidence that Murphy somewhere along the way became completely obsessed with having Glee address every social issue in existence at some point or another, and his need to have every "shocking" episode top the one before.
And then I think Cory's unexpected absence the last few episodes blew a hole in their plans and they had to whip something else together on the fly, and the last few episodes feel like a jumbled, slapped together mess. Damn, we've got episode to fill...let's sing "At the Ballet" for half an hour!
All this "climaxed"...or more accurately just paused...in the most anti-climactic season finale ever, with Blaine's ridiculous proposal storyline whipped up as (very) contrived melodrama.
The funniest part is the writers actually seem to think stuff like the Catfish and Blaine's proposal are these rivetingly suspenseful cliffhangers, while most people couldn't care less.