I'd like to start out by saying I do not PVE. I have only done one hard mode flashpoint since hitting 50 on two characters. I consider myself a casual PVP player.
I started this game playing a mercenary, I was one of the first 100 level 50s on my server. I am currently sitting in full champion gear minus an offhand (4 manhands and not a single offhand out of a bag yet). Don't stop reading now - I'm not here to gloat.
When PVP still consisted of everybody level 10-50 it was annoying to have a level 10 sitting there poking at you, to say the least. I firmly embraced the change of a level 50 bracket for pvp (By this time I was nearly fully geared, sitting at about 375-400 expertise). Once the change went through, because of long-ish queue times, I would do my pvp dailies\weeklies and go level my alt, an Assasin.
I was reading the forums about how people thought it was unfair that people geared like my mercenary (500 expertise) would just destroy new 50s. I thought to myself "sure its hard for them to beat me, but not impossible.." This was delirium. To be honest I didn't really notice that I wasn't giving someone a chance to kill me - I would just tracer missile until either I was dead or my target(s) were dead. I thought people just wanted gear handed to them to match all of the "hard work" I had put into my character. I was wrong.
I hit 50 on my Assasin about a week ago. I leveled as darkness and being so, all of my gear is set up for tanking. I knew I wouldn't be able to dps like my mercenary, but I figured I could guard and provide some aoe slowing and debuff utility.
*It is absolutely pathetic how little effect I have on a warzone*
Rarely I get top of my team, solely from getting defender medals. The only warzone I feel I have the slightest chance to compete in is huttball, being tanky with a sprint leads to some miraculous scores (if there is a geared healer attached to my ***, of course). And force pull doesn't feel too shabby either. I tell my friends I feel like I hit like a pillow, which I do. My mercenary simply doing auto attacks can out dps my assasin - No joke. (granted they are different specs and have different utility)
Anybody that feels like the pvp gear changes aren't needed, you need to roll a new character and pvp as a new 50. It is THE most frustrating experience I have ever had in my extensive MMO career. If the nerfs to pvp gear do not go through, it will be detrimental to the subscription numbers of this game.