I love Psych, but I think the first four love seasons were peak
For me personally I liked the balance of goofiness and realness. Now don't get me wrong Last night Gus, Office Space, tge series finale, and more in the later seasons were great, overall the show got a little too out there or goofy at times for me.
I think the suck it line was funny sometimes, especially when they sung it, but sometimes in the later seasons it was too overdone and replaced tine they could have spent on the case or character moments.
The stakes kind of went down a bit and some characters got a little one note. Tgats mist long running shows and it still was entertaining to the end and the films. Still a fan who will watch new content, but imo those first five maybe six seasons were magical. Perfect balance of tones imo. But either way love the show and the fans.