Jeff acted like Jeff, Brita acted like Brita, Abed acted like Abed...but the humor was just a string of quirk-driven gags, rather than being driven by the characters' emotional state and psychological history.
I think you're being overly reverential to Harmon's Community. The best gags are the ones you mention, and they're the ones that fans remember most, but it also had a lot of standard jokes and random quirkiness.
The episode was fine. It was a fairly average episode of Community. If the rest of the season is like this then I'll be a little disappointed, but I know that Community often takes a few episodes to get going each season so I'm just going to sit back and see what happens.