One person being able to 1v9, never die and still get kills
People getting oneshot
Personally, I'd rather get oneshot than not be able to kill anyone. I do like being able to react to PvP situations, but I don't like when my damage is insignificant or easily undoable.
What about you guys? What entices you to get into PvP -- or for that matter, what puts you off of PvP?