Arm is an incredibly deep mud... but don't bother if you aren't a primarily social player. Exploring kills characters. The imm staff are actively set against achiever personalities. There is a decent crafting system, but once you get geared up, there is nothing to spend large amounts of money on except other players.

Strictly put, if you aren't in the 'in crowd' by the end of your first year of play, only play Arm if you don't need karma or imm interaction to get what you want from the game. If you get sideways with staff, give up, or switch IP addresses and make a new account.