Holy Crap! I've never been so overrun with enemies as in Spartan Ops Episode 3. Chapters 3 and 4 on Valhalla are insane! Nothing like a dozen hunters at a time plus many elites and 4 or 5 banshees at a time.
Just when you think you've cleared the area....two more phantoms come in with a whole new barrage of enemies.
I did Legendary Solo and it kicked my ass! Good thing for the infinite spawns.
Still fun though!