It is ok, but they could've done a lot more to make it look better.
Several flaws in the game, including the engine leaving hit detection less than desirable. the Left hand on the shotgun looks uncomfortable and does not reflect proper anatomy (I tried replicating it on a shotgun I own, was super painful for my hand). This is just a touch up on an old game, do not expect any balancing or any major bug fixes to the old game. Same with halo 2 anniversary, just a touch up.
Ce is a decent game, good music, high difficulty curve, the beginning of the story and series of Halo (besides in the books, and reach) but honestly, Reach, halo 3 and ODST are more enjoyable, this game has not aged the best, but it is a classic. Buy at your own discretion.
and watch out for Ebay Sellers over charging (game is worth 10$ new. you can buy it on Steam for 9.99$ USD - don't over pay)
Here's to Halo 3, ODST, and Reach getting at least Halo 4 if not Halo 5 levels of graphics touchups!