Commanding sucks without a mic. Early morning pugs where I cant use my mic suck.
When I command for my clan (#blackmarket-ns) and my mic is working fine, I love it. Its about getting down to earth with your marines and understanding them.
I allocate the skill pool I got where it does the most damage.
Like if I have a great aimer, I'll send him either by himself or with the worst aimer in our team, so it evens out. I put my better marines on offensive and the such, but on my team everyone knows how to aim, so...

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Its about trying to survive. Thats what I think.
Just ask yourself.
"How will I win this?"
The answers will come up to you.
Remember this: When most marines are unattended, they go die. Simple. Keep them on the leash. I tell my clanmarines to just idle and stay in position until given further orders. Like starcraft style. I talk a lot :>>>>
Being a team is about sharing. Share your ideas, ideals and your goals. And dont be harsh on them. They are already on themselves.