I have ridiculous saves and find that caster/cleric can only 1 shot me with either searing light or scorching ray, albeit power word stun.
I find it amusing that they get upset if I trip them. When you get to 20, just laugh it off as their only 1 trick ponies at that point.
But I digress, I find PVP pointless because all it proves is that some other person was quicker to the punch on a certain spell/trick then you were. And the Lobster is the proving grounds for anticipated drop downs into the pit.