Lumeinshin
CS Source was awesome. I've played that a lot back in 00's. Installed a slo-mo mod and just killed bots in dozens, watching ragdol doing its work. Heck, ragdoll still looks very impressing, giving the rest of the physics are there to deliver.
And... that's the only one I've played out of the whole list. Been looking forward to play Dark Messiah Of Might And Magic for quite a while though, so I guess one day I'll be there.