Burning Wheel is a crunchy fantasy game. It's characterised by having a lot of detailed rules for character generation and general play; highly detailed subsystems for melee combat, missile combat, and debates; an experience/reward system that takes a long time to play out; and characters' having Beliefs that are used to drive the game forward. Neil Smith thinks that the system's complexity (and its long experience award cycle) makes it unsuitable for play in the club. It needs everyone to have thoroughly read and digested the rulebook before play, and needs 12+ sessions for things to bed down.
We've played the Jineev Jihad, using the Burning Sands: Jihad supplement for Burning Wheel, which is based on the Dune novels by Frank Herbert. See the Jineev Jihad page for some resources for that game.