Hunters are harder to kill than before in Halo 4. 3-4 shots to their weak spot with the Beam Rifle (Covenant counterpart to the human's sniper rifle) and they still stride around spamming their fuel rod munitions.
Buck's dialog in Halo ODST involving shooting Hunters in the back wasn't necessary. Only gamers that play Halo ODST are Halo fans and they already knew the different methods to deal with Hunters.
Fighting the Prometheans in Halo 4 is a brand new experience. I have to unlearn every strategy against the Covenant & the Flood to figure them out. And unlike AI vs AI battles in previous Halo games, Covenants vs the Prometheans are seeming to take forever to end.
Saber & Crytek could really learn on engine optimization from the developer of MS Flight Simulator. Shamelessly boasted about the use of CryEngine 5 on Crysis Remastered but developed the game like it's still the year 2000.