Voadam
Legend
Crits show competence with occasional wild card spectacular competence, on both sides. Fumbles show occasional wild card incompetence on both sides.To each their own, I suppose. To me, fumbles happen just like crits do. Why shouldn't both be modeled?
If you want to show competent warriors fighting dangerous foes you use crits only. If you want fog of war friendly fire mishaps you use fumbles.
If you want to model Conan and the Gray Mouser you use crits only. If you want occasional random madcap comedy of errors black humor combat scenes you want fumbles.