has it always been this way, or just since the most recent changes to the arenas about a year or so ago?
before, you could get a decent ranking regardless of kills or points, so that was okay. now, everything is points driven. if someone suicides on you, you should get SOMEthing (maybe half of the point that you would have gotten for an active kill).
if the player being suicided on is not supposed to benefit from this, then they shouldn't get credit for those kills, either. there are achievements for those.
I can see both views, many times I have been swashbuckling it out to the end with someone and disappointed when they atack and die I get nothing for the whole brawl