The game storylines I absolutely hated were FF8, Grandia 3, and FF7...especially FF7.
FF8. Never finished it, but the story was slow and boring and the gameplay was worse
Grandia 3 was just like an acid trip...like .Hack, only done badly and with no actual characterization.
I used to like FF7 until I finally realized that the villains made no sense, and the few characters I liked are either attracted to the abomination that is Cloud, or mostly ignored in the grand scheme of things, like Barret. Shinra was a good attempt at a villain, but kind of degraded into something the game designers just stopped caring. For instance both presidents aren't killed by you. Cloud is an annoying *insert degrading insult here* and not really interesting. Aeris was an annoying important Mary Sue. Jenova was just kind of shoved aside, as was most of the 'Ancients' sub-plot which could have been its own game just like Shinra. Lastly Sephiroth is arguably the worst antagonist ever. He wants to become a god, but wants to destroy the only things that would acknowledge him as one with a meteor. He himself gets only one actual scene of being a bad guy in a flashback as the rest of the time he's replaced by a clone, and his motivation for being evil is because...he thinks his mom Jenova would like it? He's just stupid and relatively annoying, and I could rant about this game for about two or more hours, and its incarnations for even longer. But what was truly disappointing about this game wasn't what it is, but how many times you see something that could be good dumped for something more simplistic, watered down and just lame.
Anime wise I hate Yu-gi-oh, Rosario Vampire, Naruto, and Pokemon from Johto season on.
Yu-gi-oh was just boring, simply put.
Rosario was just filled with too much fanservice for me to truly enjoy
Naruto focuses on the most annoying characters I have ever seen. It has lame plot devices. It's motivation for characters is just stupid, and just overly obnoxious.
Pokemon's First season was excellent, it had good lessons, interesting plots, cruel tear-jerking moments (seriously 'Bye Bye Butterfree' case and point) and was just impressive by Kid show standards, second season started to slump, and Johto on was just simply 'showcase a pokemon time' and it took four seasons to accomplish what was accomplished in season one. (However I did like the Battle Frontier saga)
Movie wise I just haven't seen many worth complaint and same goes for books.
From what I've heard Twilight is terrible.