I believe  BioShock looks the best game so far on the XBox 360.

Worst looking game on XBox 360 I would give that to Vampire Rain.

Please answer the thread title.

*Full XBox 360 games only that have been released.

**Edit: Does the best looking graphics game also have the best game play as well?

GEARS AND WORST SPIDERWICK CRONICLES

I would have to agree with Bioshock.

From what I have played Operation Darkness looks the worst.
*I have not played Vampire Rain.

Really depends on what your trying to define as "best". There are many "bests" out there, IMO.

GTAIV had a ton of stuff going on at once. That was a graphical beast, IMO.

As for worst - What are we defining X360 exclusives? I'd say Beautiful Katamari was pretty bad, but it was meant that way.

so many best games but worst is Too Human

LOL

Non-Exclusive -

Best in my opinion is assassin's creed. I dunno why, just looking at those landscapes from ontop of those towers amazed me. The player model was very nicely detailed and flowed realisticly. I loved the look from the start.

Worst IMO is Marvel Ultimate Alliance. Hate that game. Looks so bland and dumb.

Exclusive -

Mass Effect, Totally. Love the facial and outfit visuals, good blur effects and very nice to look at.

Worst for me is undecided. I only got like 2 exclusives and halo 3 isn't goin' on my worst.

Best Looking: Bioshock or Assassin's Creed

Worst Looking: Too Human

Bioshock. But soon to be outdone by Gears 2

Too Human?!?!? Don't bash a game, cos it didn't deliver what you expect. There are far worse looking games out there.