To make a game as complex as Unreal Tournament 3 you're looking at millions in dev salaries alone. Meanwhile UT3 is still available to play, if anyone wanted to.
Not being as complex as UT3 would be a good thing. I wanted to love UT3 but it's so graphically busy that it distracts from the game play. Even UT2004 — as great as it is — misses the *SOVL* of UT99's simple geometry and colored lighting.