Clerics > RMs from FlyFF. xD Just a personal opinion of mine. Why? Because we, clerics, don't drop dead after one hit like RMs from FlyFF. We can also hold our own battle and tank a little bit compared to RMs. Also, we don't get a lot of buff plz buff plzz (we get a bit of res plzz, I guess). Reason for that is because we don't have a lot of buffs to give to people. At lower levels, most of the buffs require you to be in the party with the cleric to get the actual buff (in this game, we use a thing called Scrolls to make up for that).
However, even with our lack of buffs, we're still loved and people always wants to party you. Cleric is a great solo-ing class as well (but of course, it's always faster to level if you party. xD) We may kill a bit slowly, but we survive well.
Yes, there is a PvP arena, but the PvP function thing isn't implemented yet. GM's do hold events for PvP but players can't go there and fight themselves. However, you can have battle with other people via Guildwars, which are pretty common these days (kind of).
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