For currently airing stuff: basically just drop when I'm bored with it and can't be arsed to continue it. Maybe put it on hold or something. Maybe pick up again after it's finished airing.
For stuff that's already finished: give it a set number of episodes, and if not hooked, safely drop. I'll usually ask someone who has watched the show how many episodes of it I need to watch before I decide whether or not to drop. Neon Genesis Evangelion, any Key show (Air, Clannad, Little Busters, Charlotte), any Ikuhara show (Revolutionary Girl Utena, Mawaru Penguindrum, Yurikuma Arashi), and Hunter X Hunter for example are shows that either get better or change as they go on and giving them just 3 episodes isn't enough in my opinion.
For currently airing stuff: basically just drop when I'm bored with it and can't be arsed to continue it. Maybe put it on hold or something. Maybe pick up again after it's finished airing.
For stuff that's already finished: give it a set number of episodes, and if not hooked, safely drop. I'll usually ask someone who has watched the show how many episodes of it I need to watch before I decide whether or not to drop. Neon Genesis Evangelion, any Key show (Air, Clannad, Little Busters, Charlotte), any Ikuhara show (Revolutionary Girl Utena, Mawaru Penguindrum, Yurikuma Arashi), and Hunter X Hunter for example are shows that either get better or change as they go on and giving them just 3 episodes isn't enough in my opinion.