Currently There are 4 games that have infection in the mcc. Reach,Halo 2 anniversary, halo 3 and 4. You may know how bad halo 4's infection is and how good halo reach deals with infection. Halo 3 had a decent infection with some issues, one of them being how overpowered the humans are. Don't get me started on how disappointing halo 2As infection because it had the same issues 3 had but worse, not to mention it felt like halo 4 at a slower pace. I wish halo 2 classic had infection as anniversary does not give anything similar. Currently the only way to play classic infection is if you had Project cartographer but still you have to wait until someone joins as that game is dead.
Halo 2C Infection