QUOTE(evolipel @ Sep 9 2005, 02:04 PM)
Valks are used in raiding overlords or just plain going anti-air to intercept an air attack.
Bats are used after marines if your enemy is toss (to defend yourself while you tech.)
Scouts can be an early air unit (and you can mass them too), sort of like zerg with mutas (albeit somewhat different).
Put up a camera on a hot air balloon. What you see is realistic, just not from the ground perspective.
However, SC is far from realistic. It's science fiction: it really can't be realistic (especially since the aliens/tech is unexplained for the most part).
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I know that each has a purpose, but the fact is that some are used more than others, which was my point.
Valks aren't used much at all. For one high priced valk, I can get a couple hits on it, with either hydras or mutas, say 31 damage or so, then I can fly 2 scourges into it and He's lost a good sum more of resource than I have. Most games I see come down to M&M SV and zerg goes lurks and lings, but later gets defilers and ultras.
I've never seen zealots used in massive numbers. I've seen goons however massed. I don't see a reason to use bats when they can easily use storm if you go bio or just rely on regular marines. Of course, they might use zealots to break a tank wall, but they wouldn't die fast enough anyway.
Scouts are just not good. They cost far too much for what they do. The only way to get them to be good is to get their upgrades, but that cost far too much gas. Corsairs are faster, cheaper, do splash damage and have a spell. Many people agree corsair > scout, when it comes to usefulness.
These are based on the replays I've seen at teamliquid and gosugamers. You probably can't view them now, but these players have great micro and strategy.