Here let me start first: I think that the best tank from all of the halo games has to be the Halo CE aniversary one. Mainly because you can control both guns, the cannon and machine gun. And also because marines, ODSTS, and spartans can get on the tank wich I think is about 5 or more
I kinda liked the brutes in Halo 3 ODST firefight, on alpha site, mainly because their are more of the spec ops, and I can watch them throw grenades at eachother. The fire grenades are also really fun(kinda wish they were in Halo 4 :/)
One of my favourite quotes from the series. Another is from the start of ODST: "We are losing".
There's something so brutally honest about it, and it's not a cliche story where the protagonist saves everything at the last minute.