I think that most people are being used to PS3 critisizm. Like that game Killzone2, sony just so pushes it as the 'next graphical wonder that only was made available to the universe because of Blue-Ray and Cell'. Yet if you look at Killzone2 and you compare it with the graphics that a 400$ pc graphics card produces you just wonder what is so high-tech about Killzone2.
On the other hand you have games like metroid that look more artistic, compare it to okami(?) on the PS2.
Halo is not looking bad, it's just looking above average and it offers much more then the game needs. And indeed it isn't the miracle looking game that will cause an alien invasion but i don't think it has been announced like that.
Look in this world Sony is the only institution left that wants to sell games by it's graphics. We all know how good that's going...