6.43 Million Copies while GoldenEye 007 for the Nintendo 64 sold 8.09 Million Copies while Half Life sold 7.85 Millions Copies. Clearly Halo didn't expand on the FPS genre in terms of audience. The best selling game in the Halo series is Halo 3 with 9.72 sales while Call of Duty: Modern Warfare has sold 11.79 Million copies between the Xbox360 sales of of 7.43 Million copies and the sales of the PS3 version of 4.34 million copies.
If Halo expanded on controls, just look at what The Conduit is doing with the Wii Remote.
Wait, so Halo only had customizable maps? That seems a back step from making custom maps from the 90s.
Yes, Halo has been out for years while competitive play has been around before Halo.