Supermeep: Suicide grunts are great as long as they don't freeze up.
I don't know about the Arbiter not having a health bar, but sometimes my buildings won't.
No they aren't http://www.halowars.com/stats/StatsGame.aspx?Id=21752273-3126-9023-8930-000000000000
Halo Wars strategy timeline:
1. If you don't use hawks, you lose
2. If you don't rush gauss, you lose
3. If you don't rush as a Covenant, you lose
4. If you don't feed you lose
5. Now, if you don't Cryo glitch, you are going to lose.
I <3 ODSTs