Didn't like Bill Cipher, went from demonic terror to a frat boy. Finally made it into our reality after thousands of years of wanting in but, for some reason, decided to go party in the Fearamid for 6 days straight. The reason he couldn't leave Gravity Falls was nonsense, but that's par for the course. Could do pretty much anything he can imagine and, outside the first 5 minutes, didn't do anything imaginative aside from like make himself bigger. Was too incompetent throughout the series.
Gideon's a crap character, Mabeland could've been a very emotional episode but didn't deliver, Pacifica was snubbed, the Cipher Wheel was pulled straight out of Ford's ass and the reason it didn't work (Stanley can't stop arguing with Ford for a minute) was dumb. Stanley's sacrifice was a powerful moment but was instantly remedied for muh happy ending. etc etc etc.