I wish they kept Infection, and the Energy Sword.Honestly the energy sword, and infection are what got me into Halo, and what made the Halo not just an ordinary First person shooter, but also have another interesting, and fun game mode. The current Flood Gamemode in Halo 4 looks nice, but doesn't beat Classic infection. I just hate to see the Energy sword go to normal combat because the energy sword sucks at normal slayer, and its harder to get a kill because you are a normal spartan, and not a super powered zombie thats fast, and agile. I wish times were like Halo 3.
I hope other people feel the same as me.