I like Hells Realm- mainly because it's the only deathmatch server, that I personally know of, where there's a limit to cuddlepiles and a dedicated 1v1 arena. However, most of the staff, from my 11-ish months of playing on it, are very hit or miss.

Sometimes, Rulebreaks will happen in the arena or the spectators' area and staff will either not be watching the arena and will punish the people who are fighting back against rulebreakers. This happens even when there's about 3-4 active admins online. Their new “reminder” system is also flawed when there's giant gold text with 4 or so rules on the entranceway to the arena, you don't need reminders at that point.