The biggest problem with 2k4 redeemer arena was the lack of good maps. It was especially difficult for hide and guiders, as there were few cool hiding places in the maps.
Often there are some nice dark corners or rafters in these maps, but for some reason you are not allowed to go in there, the way you would be in UT99. These spots are drawn in the map, but don't seem to actually exist in 3D space.
Btw anyone who has 2k4 but has not tried
Slayed's Hell Awaits yet is cheating himself out of a cool server, with some bitchin' maps.
And many of them could work well in 2k4 redeemer arena, too.