Many people complain about Proxy and the majority of it is because of her annoying nature. She 2/3 hit kills you most of the time, runs insanely fast, and mines suck butts.
However I think the real problem with Proxy being so good is 1) her tiny body (hitboxes) 2)her evasive capabilities and 3)shotgun problems which are explained in another thread.
When you get to a high level of play, being able to evade is much more effective than being able to tank. The aim of players is so accurate that you will be dropped fast if you do not move. Moving is what makes your head (which is pretty damn tiny) hard to hit, and not taking head shots is how you survive. Proxy is able to move at a very high speed and jump quickly, making her very tough to track.
Even so, you don’t have to track her for too long because even in medium range she will drop you in three shots. This however is discussed here http://forums.dirtybomb.nexon.net/discussion/1823/the-true-problem-with-shotguns-and-aura#latest
What also makes her tough to hit is her skinny character. Compared to other she’s very tiny and tough to land shots on.
So altogether you’ve got a leap-frogging twig with an OP shotgun
However this is only true for people skilled with movement. If you don’t know how to do anything besides WASDing you won’t be effective with her.
Possible changes include increased hit box sizes and/or lessening the ability to jump spam (ie. make her slower when she jumps)