InuYasha, I know it gets a lot of flak on A/M/C and mostly everywhere. It's not 'crap' to me, but it was my first true anime/manga series that introduced me to other anime when I found out about anime.
I hear you with Inuyasha. Even though my brain logically knows it's a cliched series, I still find myself enjoying it anyway.
My other example would probably be RWBY. Despite the poor pacing, cliche characters, and dodgey voice acting, I still keep watching it. I can't explain it!xd
I really like both MAR and One Piece despite how many people seem to dislike them. I admit that One Piece is obsessively long but I still keep going back to it. Inuyasha is pretty repetitive and lame but I still enjoy watching it just for the nostalgia. I think Fooly Cooly would be my ultimate guilty pleasure though. It is such a messed up and nonsensical show but I love watching my DVDs of it time and time again,