halo 3,graphics and gameplay?

[kevin757685]

i have heard that the graphics on halo 3 arn't much better than on halo 2,shurely gameplay is just as much a factor as i for one would rather have a game with good gameplay as opposed to supper graphics,i am looking forward to the game when it comes out on the 26th of september but hope that it won't be as short lived as halo 2 was.
is there by any chance a playable demo coming out as this would give a good idea as to how the game played.