Not at all. In my heyday of gaming, that's essentially what it was. There was about 4-5 of us in the group, with 3 of us alternating as GM, once in a while during the same sessions. When the synergy was really happening, we often would forget about the rules altogether and just toss dice when the appropriate randomness was needed. I think more than combat itself, we made a lot of use an old school D&D reaction table that used 2d6, and several subtables that boiled down to Attack/Leave/Friendly that we freely interpereted and added modifiers to.