I have to say I think Marauders are great for PVP, I run with one most of the time for WZ's and we duo'ed every flashpoint from lvl 20 and up to 50 when we were 1 to 3 levels below them, and know first hand much damage and utility they can bring when played well.
Reading some of the comments makes me laugh because it's obvious some of you haven't run into any Marauders/Sentinals who can play them well. The vast majority of them I can easily rip through (BH Merc Hybrid build) and I don't even really view them as a priority to take down most of time. However there are a few that will tear through me in a heart beat and I haven't really found out a real way of countering yet. Not saying it not possible , I think that Arsenal spec could work with the knock backs but what happens when you hit full resolve? Anyway I'm not to worried about it since It's rare to find well played ones at this point in the game. Unfortunately when I do though, they make a B line for me as a healer and tear me a new one.
I don't think that Marauders are OP or that they are harder to play than any other class for that matter, everyone likes to make it sound like their class is the bomb digity and complex lol I do envy the force leap though...