Absolutely stunning graphics, incredible gameplay and the best bot AI ever.  This game is packed with value, with far more levels and game variations than Quake 3.  The UT single-player experience is also more  rewarding.  I blew past the Q3 single-player game in 2 sittings (at the  "Hurt Me Plenty" difficulty), but UT (at the roughly equivalent  "Adept" setting) is going to take me a lot longer, because UT has  so many more levels, and because the gameplay is deeper than Q3's.  This is  due, I think, to the slightly slower pace of the game (unlike Q3, a  powerful weapon is not always within easy reach) and the much more balanced  and varied arsenal.