Okay if I could name the weakest class it would probably be Glacial Master. (Gonna get a lot of hate for this.....)

Now I have fought hundreds upon hundreds of matches with my eternal. My RP right now is 1125 (Highest 1147) and I love my Eternal too death, one of my favorite classes but I think he is the work class pvp wise in my honest opinion.

I haven't used every class in PVP from beta to on ward but I believe my point still stands.

He has no quick AOE abilities (like ashe fork, tornado kick, seismic slam, etc) meaning if someone is on your Y axis you can't hit them at all. In this situation I just wait till they make a move, teleport and then punish, or I wait till they get close and use Ice Trap/Blizzard storm but that doesn't always work out.

His moves leave him wide open for very long periods of time if you miss, mainly grand shatter (don't know why this move has no super armor if it takes so long to use)

He has almost no defensive abilities other than the lucky freeze you may get mid combo. He has that ghost flame skill but that doesn't help much. I wish he had some sort of ice armor or a mana shield like F mage.

Some of his skills don't always work like they are suppose to. Like Blizzard storm not freezing someone caught in the circle, or how broken arrow can't hit a moving target right in front of you.

He has amazing damage though and that might be his saving grace. Can take out an equally geared opponent in 2 combos if your good enough.

Again like I said I love GM and will continue to use him in PVP, but I certainly have to work harder compared to other classes I have played to make him seem good.

The class I see least of all is maybe F slayer surprisingly. When I do see one its always sword master.