I've watched both Community and Parks and Rec from the start, but while my enthusiasm for P&R has gone up each season, I am in the same boat as you when it comes to Community this year. I just watch out of loyalty, I guess, but it is the last show I watch on my DVR other than the Mindy Kaling show (and I delete half of her shows
I watched 2-3 episodes earlier this week to get caught up, and it seems to me that the way the episodes have progressed, the writers are giving themselves a clean ending for the series in the final 2 episodes. We know how all of the characters ended up at Greendale and I think they are taking their last final this week. It would be an easy way to end the show.
And I think this season has gone overboard with references to previous shows, gimmicks, meta-jokes, etc.