Ah... don't think I played Blast Corps. Total Annihilation was the one you always heard about as being better than Command and Conquer but nobody played it. I recall the story was that some competitor bought them out and shut it down, but wikipedia doesn't bear that out.
Total Annihilation was superb, but hard to swallow now - early software 3d rendering did not age well. The best successor is Supreme Commander: Forged Alliance. Amazing sense of scale, and the ability to give orders
once like "this factory should make 2 fighters and then 1 bomber, repeating, forever, which fly this patrol pattern and refuel whenever they need to" without any more endless clicks of micromanagement. It's a revelation.
(SupCom2 is a POS though, skip it.)