I've finally got the right build for me at my level. Woo!
I'm a L43 Marauder on late Act 1 cruel. I wasn't doing enough damage, so when I found a totemic mace with 4 red gem slot (3 of them linked), I crafted it to a rare and got +78% physical damage and decided to go with the well known ground slam marauder. Lots of damage, but I was getting slaughtered.
So I tweaked the build. Back to a 1H mace (rare petrified club with 3 linked red slots, good bonuses and 20% quality) and a shield. Ground slam and heavy strike on the club, both linked to a life gain on hit that gives me 24hp per hit, which is a fair bit more than either skill costs. I've taken life leech passives as much as I can, plus resists...it's basically the standard ground slam marauder with extra mace damage skills. DPS is reduced a fair bit, but I do not die. With 2H standard ground slam marauder, Brutus stunned and quickly killed me. With this modified 1H ground slam marauder, I didn't even need to use a potion. Straightforward chaining heavy strike. I stumbled into a nasty pack outside - The Burning Menace, a named bearded devil underboss thingy and a whole slew of bearded devils and those lupine things that set the ground on fire when they die...and I walked through it. A bit of equipment management and I have 1400 armour and 75% resist cold, fire and lightning. With 5 superior colossal health flasks (I've taken blood magic, so no need for mana), a heavy single target attack, an area of effect ranged attack and sizeable hp gain on each hit (which is every time - I've taken resolute technique), I'm laughing. All I want now is a 4L 1H mace so I can add life leech on hit as well, or maybe elemental damage.
I heartily recommend this modified ground slam marauder build if you're around the same level. It rocks.