Ok, first off, I loved ODST campaign, but ODST and halo 3 were by far the easiest legendary campaigns. why? Because you didnt have to fight freakin elites... I would take the strongest brute on Halo 3 ANY DAY over the weakest elite on Reach. The Elites were almost impossible to kill from long distance because you would take out there shields with 1 1/2 clips of DMR then they would hide and you just wasted your ammo. close combat was a joke too, even with a sword. you would go up slash their shields away, then they would kick your life/sanity away. If you say Reach campaign is easier than ODST/3 campaign, you clearly dont play legendary. jus saying...
Reach had like one or two tough spots, Halo 3 had like one or two tough spots. Both were rediculously easy on legendary. I mean, hell, most of the time in both of those campaigns you had invincible NPC's that helped you, and in Reach there were a few levels were you had multiple invincible NPC's that helped.
Halo 2 was damn near impossible because of the restart on legendary. It made it so you pretty much had to do everything without dying. At all. Ever. That's ****ing tough.
Halo CE was pretty ****ing tough, too, but thankfully you didn't restart upon death and the Hunters were obnoxiously easy to kill. Plus Plasma Pistol+Pistol meant you were pretty much a walking tank for most of the level. CE was slightly more manageable out of the two games (CE and 2).
Mom... You made a monster and I'll be making minions by the minute... Thizz iz what it iz GT-Spidux