I think they spent too long on the dream sequence and I thought it was a little too absurd for Jeff’s brain. I would have rather seen Jeff and the group actually interact with each other and calmed Jeff’s fears about graduating instead of him figuring it out himself.
The series started with Jeff admitting that he needed help to pass Spanish so he could get out of Greendale as soon as possible. I think having the group help him through his fears so he actually could leave Greendale would have been a nice way to end it.
I just want to point out that these are all the same show.