I still do not understand how using Mandalorian tactics with larger numbers makes him not a tactical genius.
It was literally an unbeatable strategy.
It's a good strategy. His use of their strategy makes him a good strategist, but not a genius. A genius creates a tactic that completely outwits and outmaneuvers the enemy. Revan basically hit the Mandalorian's proverbial 3-inch thick Durasteel wall with his own 6-inch durasteel wall.
An effective strategy, but not the best strategy. He's a great strategist, but not a tactical genius.