Gonna add some of my own opinions here
Mechanics like Persona's social link system are dumb and should have never have gotten past the concept stage, it should be replaced with a system where I can pair certain characters together and get more characterization out of them, it shouldn't only be the MC
Sonic was never good and I never understood the appeal, Mario was never good either (The Galaxy games are the only exception)
Games purely based on it's difficulty aren't good games
Games with time limits should have a mode where the time limit is excluded, mainly speaking of games like Dead Rising