Hmm, I dunno... I picked gadgets and rifles from the get go, and I can run down ring users like nothing.
Having said that, DCUO is the first game in a looooooooong time that I've enjoyed pvp'ing in, and I took to it like a duck to water, which surprised even me.
Being a PVP aficionado, I can tell you what makes the PvP good.
1) It does not punish you for PvPing. You don't have to fear exp/equipment loss or feel guilty about griefing some schmo who's just trying to level.
2) It does not allow opposing factions to communicate.
3) It occurs naturally - you will run into players on the other side who have goals that contradict your own, so conflict is the logical result. There's no complex moral ambiguity - THEY ARE THE ENEMY, BEAT THEM UP!
4) Jokes about X being OP aside, it's actually pretty balanced, and is more reliant upon human performance than stats, build and dicerolling. Sure, if you get the jump on somebody and execute flawlessly, you'll probably win, but one wrong click and they have a chance to completely turn the tables on you.
5) If you're totally fed up with getting pounded on at location X, there are other completely viable locations Y and Z with missions for you to do - it's not like WoW where you're pretty much limited to one location per level bracket.
I haven't experienced it yet (because I just started as I said), but from what I see there's also larger scale objective based PVP in the endgame, which sounds interesting. It may not be as good as RvR, but what is? (not even RvR, these days... stupid EA ruining another franchise)