Freddy dies in the second last episode so you would expect them to use Cook and the gang searching for and finding Freddy to be the main plot device for the season finale.
Instead they have a party for the first half and fuck all gets resolved (apart from Naomily, but they didn't even throw in a sex scene D:) Then in the last 5 minutes Cook goes to Freddy's Killer's house and finds out Freddy is dead. The guy who killed Freddy finds him in his house and calls him nothing, Cook tries to tell him that he is Cook, but gets cut off mid scream.
You don't even get to see who wins the fight or anything.
But tbh, it's not even that which lets down the whole series, its just the writing in general. There isn't enough JJ, Thomas, Panda or Katie which feels like a bit of a waste. The humor is just the same recycled shit. For the majority of this series, pretty much nothing interesting has happened, and when it did it was so random and out-of-the-blue that it just doesn't seem plausible and was annoying. It's just been a big depressing waste of time and why am I even typing this