I didn't find it too difficult on my marauder (annihilation specced) at 32. Well, except for the part where I didn't heal up between fight #1 and 2 because I had no idea it was coming. But between saber ward, cloak of pain (i think), and obfuscation or whatever it's called, I was able to get the guy down using a cheapo health pack I had.
It also helps as annihilation that you get tiny self-heals when bleeds crit, and on gold mobs you can usually get enough stacks of fury to pop berserking for the 6x guaranteed crits/heals. Each berserking is good for roughly 900-1000hp at that level.
Well I respec'ed my Maurader since then. So it may not be the issue it was at the time. My skills were all over the place before I redid them. I've gone all the way up on the carnage tree and I do a lot more damage now and have more attacks I can use.