as to story being part of gameplay, you are totally right. The thing is that *most* games handle them separately, they do not integrate the two
take a game i worked on, NWN2, the gameplay and the story had nothing to do with one another. You literally had a bunch of verbage that could have come from anywhere combined with a dice rolling tactics game, and they really didn't mean anything to one another- you could have taken that story and put it in any other game, or the game with any other story, and got the same result
that's why I say that the game and the story are different things- because it's the very very rare exception that they aren't
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I don't think PS:T had good gameplay, by which I mean that the non-verbal gameplay wasn't that good. It wasn't awful either, but it was not as good as IWD or even BG2 (which I didn't like). Obviously this is my opinion and not incontrovertible fact, but it is an educated opinion.
most games, like NWN2 or gears of war or COD or whatever, do not merge story and gameplay in any meaningful way, most do not have verbal gameplay at all.
a few games, bioshock, HL2, morrowind, ps:t , AP, utilize the specific medium of games to merge the story and the gameplay in a way that is cool and awesome and promising. of those that do this, only a few of them (the ones I've listed above, for example) manage to have stylistic depth, ideological content, metaphor, etc in the same way that good examples of other media have as well.
I don't think we should let games off the hook for being dumb just because they are games, nor do I think that we should let them off the hook for being unplayable because they are smart. but, and this is the part that I think made some people mad, when it comes down to it, I am more willing to accept dumb, fun games, than unfun smart games.
That might be some sort of fucking heresy, but I've never played a game that was as smart as a good book- i've also never read a book that was as fun as a good game.
we cannot let our desire for smart games (or, ugh, art) make us forget that they should be fun and engaging- otherwise it's not a game, it's just a fucking interactive novel and no one likes those except, apparently, rapey nipponophiles.