[b]Generally[/b] these things sound cool in theory but they end up being a supporting character and well, everyone wants to be a protagonist syndrome kicks in.

That, or they just don't get to do anything, like, ever. Crucial moments on combat-oriented RP's are, shock horror surprise, usually combat-oriented, and therefore require combat.

The hilarity of a non-combat oriented combatant trying to partake in this aside (which would be a redeeming factor IMHO, and totally worth it) it probably won't end well unless the writer is, y'know, capable.