Hi.
I'm currently running a HarnMaster III campaign; and yes - I've done this before. Disclaimer: I'm a big fan of the system, and have written for Columbia Games & been involved in official rule rewrites. BTW - I'm also a D&D/Pathfinder fan.
HarnMaster (like pretty much any role playing system) is pretty flexible. The traditional game is one of low-magic, no divine intervention, and poverty, as Jan van Leyden described previously. Since I like playing "heroic" games, the parties tend to include a fair number of knights/soldiers more than farmers/serfs; and everyone is born free. My current campaign features a bunch of Laranians (two young knights, a yeoman, a priest, and a cook) in a small coastal town who solve mysteries (two murders and a kidnapping thus far). Not your typical scenario, I grant you, but we're enjoying it.
The base system is skill based. An average of three stats (plus a small bonus based on your character's astrological symbol) make up the base for any skill. The more you use a skill, the better you get at it. I like how there's reason behind a character's advancement (whereas in D&D and Pathfinder there really isn't).
I've heard HandOfEvil and Jan van Leyden's arguments against the system before. It's true - it's not for everyone. But to me the rules are pretty straightforward. What throws most people though is that it's not damage you track in combat so much as fatigue. You accrue fatigue with every action and with damage. To set up the character sheet is a bit math-heavy, but once done, it's just a matter of keeping track of fatigue. Get too much - roll xd6 against your endurance. Fail? Fall unconscious. Succeed? Stay standing. Since it's not as linear as hit points, it can generate "die hard" events where the PC just keeps taking and dishing out the damage without falling. Since the game is realistic, they will pay for this later (healing is slow and hard without magic).
The community is ... well, it's a community. There are good folk amongst it who will try to help whenever they can. And then there's the unhelpful folk. Everyone's got an opinion (or two...); but it is an active community. The forums see a ton of traffic and there's a lot of fan-written articles available for download from
lythia.com.
So, if you have a specific question about the system or the background, and don't like the result you're getting on the HarnForums (and I miss your post there), ask here -- I'd be happy to help out.
The short answer (TL;DR): Yes I run HM3 in its own background, and I like it. Ask me questions.
