Anyway, I would have thought UT3 would be the most played, since it is the newest and everything
UT3 was an epic failure.
It seems like most people map for UT3 though, why don't the majority map for the original UT if it is played the most?
There probably are people still mapping for it, but it's hard to want to release new maps and mods for a 10 year old game that is long past its prime. UT99 has more custom maps and mods by far than any of the other UTs, perhaps more than the rest of them combined.