For AB, after 4 hours of play, there doesn't seem to be a problem.
For RA, where things are much more up close and personal, there might be problems.
The /report system would need to enforce that only true abuse is allowed - running invinci and running builds isn't. That's what the time limit is there for.
While some would be quick to point out their definition of griefing build, there simply is no such thing. As an example: Enchant based build will be invincible to damage dealers, but will be instant death for hex/anti-caster team.
Regardless of experiences, there is no such thing as wrong build. There are only those against which a player isn't prepared. In random arena - this happens very frequently.
In addition, I also feel that the report system should be limited to game time only (if it isn't already), so that /report only functions during actual match time. This would give people the chance to leave the match without penalty after it has ended, but new one hasn't began yet (it might work this way already - I don't know).
A

