Thrall arena is a pvp area.
We understand the players concerns... and this is always going to be a problem with PVP. We are looking at options but some are not possible at this stage, like the suggestion of level based grouping is going to hurt players more than help them... this is something we have seen in another game where players complained about how it removed any opponents in events, mostly because one player had leveled too quickly and moved into the next bracket so they cost themselves rewards..
The problem is that players will use the argument that PVP is not against the rules, which is true.... and harassment and bullying in game, is a very fine line.