This game is brimmed with pure action and plenty of challenges if you so wish.
The premise is simple for the single player tournament. Violent matches against enemy opponents (bots) is the sport of the "day".
Contains deathmatch, domination (keep control of control points), caputure the flag, assult (attack, then defend, objectives).
The bots can be quite challenging at higher levels indeed. And even at lower levels can push you around a bit.
A fun array of weapons, from running around with double pistols, rocket launcher and sniper rifle. And the ever fun remote controlled nuclear missile. All weapons have at least dual mode, either faster, more inaccurate, fire - grenades instead of rockets, pulse instead of projectile and so on.
Few more things are more fun then running around, preloading 5 rockets in your rocket launcher only to have your enemy pop up right in front of you and have your weapon shoot off.
The graphics hold up fine enough in this day and age even if not pristine anymore. You can clearly see what things are and what they aren't.
UT is a great buy, a fun trip back to the days of origin of pure "arena" multiplayer games.
Buy it, play it, love it. :)