I'm try to get some good mutators but it seems i don't know the best and I would like to know what they do. So if you can please tell me some good mutators.
I think that there are not good or bad mutators, it only counts if they are enough funny for you. Many (maybe too much) mutators exist but I think right away about four ones.
Volatile ammo
It's the UT standard mutator I always use on DM in LAN/WAN with Buffalo_Bill. It's for realism and for fun, try it ! Some days ago me and Bill have tried in LAN a Rocket Arena match on "CON Arena" map with volatile ammo...it was pure madness !
DecalStay
It's a smart mutator used for setting objects damages permanent on a map. Very realistic. Try this mutator on "Morbias" map and you'll see the effects...
Redeemer2k4
It's a mutator that changes the graphic effect of the UT99 redeemer and turns it to UT2004. Nothing special but a fine explosion effect.
InfraRed (IR) Googles
The word says all, it's useful to find players on the darkest maps. If used for a limited time as a bonus, it may be funny. I've seen this mutator much time ago but never tested it.