I'm one of those republic scrubs and my pvp sucks because I'm new. Against imps we just get zerged on by their premades and can't do anything against their team comps and overall teamwork and strategy which admittedly trumps ours (though thats not saying much...we're mostly PUGs, the best on the imps side are in premades).
Also to the people saying "just face people better than you and you'll learn" you have to realize that you learn nothing from facing people who are higher level, better geared, premade, and facing a group of PUG republics. Sure you can learn your defensive CDs better and try to focus one target, but there is no way you are winning that match when you are outgeared, outleveled, outmatched, outcomped etc. Yes, in SWTOR, being outcomped IS a thing. A well-balanced team that covers each other's class and spec weaknesses will trump a team of 8 random classes+specs just thrown together every time.
You get better through close matches, not lopsided, uneven ones where you stand next to 0 chance, and can't really learn from your mistakes since the main reason you lost was being outgeared, outzerged, out-team-comped etc. We are talking about groups people that run balanced comps of juggs, powertechs, healers, and a marauder or two against people who are leveling up random classes on the pub side because they find them fun.
There is a point where your "PVP skill" only takes you so far and there is nothing you can do against these well-thought out comps run by premades who are probably talking on skype or vent.
I'm not complaining, just stating the truth. And I realize that I'm new and have a lot to improve upon in my PVP, but the fact is that there are far less PVPers on pubside who are willing to group up and zerg unranked WZs like the imps do. Being a great PVPer can only take you so far.
So if you're an experienced pvper, please give pubside a chance on this server, you will help the nubs on our side like me out a lot. Thanks!