The writing is bad.
The acting is bad.
The CGI is bad.
The plot points of the finale was… serviceable if, at least, entirely predictable.
At least it’s finally over.
EDIT (now that I’ve finished it)
Dustin’s final speech really didn’t jive at all with what we saw during the show. The show was basically 5 seasons of nerds being nerds with a couple of jocks doing jock stuff. I don’t know where that came from.