On Heroic. It's actually pretty fun because it isn't [i]too[/i] hard but it still makes covenant much scarier. Also, anytime an Elite whips out a Concussion Rifle, your life will be hell for the next few hours as you try to kill him. And Hunters are almost unkillable. You know what, AMA.
I'll be picking up halo reach a lot more often when it becomes backwards capable with the one. Long nights of custom games here I come.