Halo was one of the first console fps games that got the controls right. Before Halo, FPS games were only really good on the PC (though some console ones like Goldeneye and PD were good despite bad controls). Mouse and keyboard are still supreme, but Halo’s one stick looks one stick moves scheme brought consoles out of that awkward to control range.

Moving around effectively in Goldeneye or PD was an art. In Halo, like PC games, it was natural.