Most of your arguments here are based on the fact that halo is only released on console. It's obvious then that it would have these console shooter features. If it were released on PC it obviously would not have aim assist.
> and the aim reticle is 1/3 of the way up the screen, instead of the dead center like you'd expect in a PC FPS.
This is something people would easily get over.
There are still people playing Halo 1 for pc online (Even after microsoft shut down the servers) and there is an even larger community playing a reverse engineered Halo version that was released in russia as F2P. (http://www.reddit.com/r/haloonline)