They were okay, but 4 close range hits with a shotgun is just insane. The Tartarus boss fight was okay, but I never knew that the shield glow thing actually disappears, since I killed him on accident.
No, multiplayer is required for people like me and many others that when you finish the story, you won't play it anymore. Also multiplayer is a way many players can come together in harmony to kick each other's butts. So I don't think it would be Halo without multiplayer.
1. The Arbiter
2. Falcons!
3. The Enforcer Sentinel things.
4. Multiplayer maps based on campaigns from previous games (like a map on the remains of the pillar of autumn in Halo CE)
5. Drop Shield
6. Plasma Repeater
7. Dual Wield
8. Grenade Launcher
9. Specter
10. Halo 2 Rocket Launcher heat seeking.