I've been playing with and under Marius since 2006/2007. He is patient, creative, fun, and fair. He is great with voices and accents and is good at diplomatically pushing things along when people, usually me, get off track. He learns rules quickly and is good at explaining them, and on the once-in-a-blue-moon time he doesn't know a rule or the players throw him for a loop, he's either fast at finding the rule or making up a sound temporary judgment on the fly. I strongly recommend this GM.