Assassin's Creed have amazing graphics and are amazing games.
Games whit rather good graphics:
+ also good gameplay (my opinion ofc)
Crysis 1 & 2 (above average graphics) In Crysis 2 should hava been better graphics, but becouse of consoles they used the same old graphic engine from 1 so current consoles could handel it.
Witcher 2 (above average graphics)
Portal 2
Mass effect 2
Gears of war 3
Red dead redemption
Battlefield 2
Gameplay > Graphics
If you think it's not like that, then you don't deserve a computer/console.
I must admit that Graphics is a plus if the game itself is good, but only on that stage.
I agree gameplay > graphics
But
I don't understand why people keep making this comparison, some people make it sound as if though you can't have both. You need great graphics and gameplay if you expect your game to appeal to the masses. There are some exceptions to this, such as some mmo's and wii games but not a lot.