I get that sometimes, mostly during PvP, because that's all I do these days. You just get in the zone and get lost in the brutal acrobatic orchestra of blood on the screen. Opponents dropping under under your sabers and screams (oh, how I love to scream). The thrill of immediate contact with your prey that ranged classes just can't give you.
Throw in a few troll skills like force camo, undying rage and terrifying roar, or whatever that's called...
...man, I love my marauder... and I'm "only" carnage.
Of course, sometimes it's just a cc/knockback-fest and that sucks.