4. More Spartans
Playing as part of a real Spartan squad in Reach was awesome, being a lone wolf is great for a while but sometimes you just want some company. From the gentle giant Jorge, to the techno-centric Kat, the Spartans of Noble team were all memorable characters. Battling through Reach with those five at my back really added to the experience, even with the aforementioned A.I problems. With four years since the end of Halo 3 and the Spartan program back in full swing I'm keeping my fingers crossed that we'll be seeing a lot more of them in Halo 4.