Bi-polar Glee

I think my biggest problem with GLEE is that it’s really an episode dramedy masquerading as a serial story. Granted, there are some recurring plotlines, but the characters don’t change.
The lack of evolution or progression in the wrong direction is most visibly evident in some of the key relationships. The main players in the love triangle of Quinn, Finn and Rachel act differently in any episode, as if the previous developments meant nothing. Maybe that’s a result of High School hormones, but I’m more likely to accept that it’s just a matter of convenient writing.
In particular, Rachel’s actions seem totally unwarranted, considering the way Finn has treated her and the fact she has given up on him already. It’s almost as if she’s in GROUNDHOG DAY and every episode is a new one where she will try to woo Finn. That’s a fine concept, except that this series isn’t episodic and characters are supposed to grow.
I also hate the short term memory demonstrated every time they have to sing. Early in the series they would wear their emotions on their face to show how they felt, but now the kids just get right into the swing of things. Again, there is a possible explanation, which is that they’re becoming more professional and hiding it. I’m more inclined to believe the writers are just glossing over points. Specifically, where is the fallout between Wheels and the Asian girl? There’s a ton of other examples of stressed relationships that seem to be cleaned up during the 6 days the show is off the air.
Every episode is enjoyable, it’s just depriving itself of its full potential by these ill-conceived character stories. A show can have ridiculous characters doing ridiculous things, but you can’t have them acting out of character. It just doesn’t work.
Recently we saw the compassionate side of Sue Sylvester in her treatment of a retarded girl. This seemed out of character for her until we learned that she had a retarded sister, who she lovingly dealt with. Ok, great, that explains her actions for that episode. It doesn’t explain why she’s a jerk to a kid in a wheel chair, a girl with a stutter (albeit a fake one) and minorities. She can’t be understanding one episode and just flip on a dime as the writers please. How has no one else called GLEE out on this????
I should have seen this coming since Ryan Murphy has such a large hand in GLEE. His other baby, NIP/TUCK, also has meandering story lines and characters with short term memories. There it is excusable since the show is so ridiculous. In GLEE it’s tougher to swallow since the show tries to be grounded in some version of reality.
Does this bother anyone else?????