I can't decide to many here is some. OHSHC, Vampire Knight, Hetalia, Vampire Doll, black Butler, Sailor Moon, CCS, wallflower, Pandora hearts, and many many many many more.
I haven't really read a manga I didn't like but I've seen anime that were just awful. Super Milk-chan and Shin-chan both come to mind, if you can even call them anime.
This is a hard one. I like so many games that it's hard to pick a favorite so I'll just list some. Legend of Zelda series, Halo series, Super Smash Bros. Brawl, Metroid, Okami, Dragon age 1 and 2, League of Legends... the list goes on.