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Well, disagree all you want but you're WRONG :D

A game with a good gameplay will always be good even if its storyline is nonexistant, simple or absolutely ridiculous. See new Ninja Gaiden games, the Splinter Cell series, practically all the most important fighting game franchises (call it Street Fighter, Samurai Shodown, Guilty Gear, Virtua Fighter, etc), TETRIS, Super Mario games, the Doom series, the Dragon Warrior series, etc. Most of them don't have such deep or complicated storyline (or don't have any at all) and they're all excellent games that marked their respective generations.

But... a good story won't save a game with a shitty/wasted/defficient gameplay. See:

-A lot of the now-generic-it's-so-boring JRPGs.
-Killer 7.
-Killzone 2.
-The Call of Duty game released after the first Modern Warfare. Based on WW2, historical crap, etc. but the game was boring as heck.
-Silent Hill Homecoming... simply horrible.

In few words:

A good story can make a good gameplay experience better, but it's not necessary. A game with a bad gameplay will ALWAYS be bad, it doesn't matter if the plotline was written by House MD writers or similars (to put an example).