I'd still say that Close Combat is better for the realtime genre. Graviteams games are great too, butas CCIP said, the maps are way too large and it lacks multiplayer.
Combat Mission, while can be played it realtime, I think most play in turns, so I dont think it compares. Great game that too, just their business model and dev team are bunch of idiots.
TL
R: Get Graviteams games if you want realtime SP action, get CC if you want realtime MP, for the rest there's Combat Mission (bring your wallet).