I love manga/anime based video games. Most games based off of movies and cartoons suck. But games based off of anime or manga are usually good. I guess you just got unlucky, OP.
Like the .hack// games. Those are so good, they're almost orgasmic. Or Gundam games. I love the old Federation vs. Zeon.
But then we reverse it! How about anime based off of video games? Well, most anime like that is based off of a hentai game. Like Shuffle. Actually, I think the Shuffle anime is a lot better than the hentai game.
Oh, and Naruto video games are usually fun. I liked Naruto 4 for the gamecube the best. Too bad they never brought it to America, and my time's already ran out to get a copy and a freeloader for it. =( But I still kick ass in Naruto Ultimate Ninja, especially when I play as Hinata.
And then there's video games that aren't necessarily based of a particular anime or manga, but ARE done in an anime/manga style. Persona 3 is da bomb! Phoenix Wright. Artificial Girl 3. Guilty Gear.