I have GRAW 1 + 2 from Retail.
I never finished GRAW1, so I never even began GRAW2 - hehe.
But, yeah - GRAW1 PC, from what I played, was awesome. I just wasn't that good at it.
Never got the original classic GR's, for some reason...
I don't know if the classic one will be playable now. I'll buy it next time it goes on sale just to check it again (said that about commandos, bought it and never played it)
GRAW1 is great. I played it about 50% and then lost the disk. Some time later (years) bought GRAW2 on Steam. Is mostly most of the same (in a good way) but I found the gameplay a bit better. The interactions are enhaced, the interface is cleaner, that kind of stuff. I'm at 50% of that one too, should play it again soon, was very fun.