Of the ones that are on Steam C&C 3 and the Kane's Wrath expansion are the only two on there that are worth paying any amount of money for in my opinion. Red Alert 3 might be OK if you can handle the idiotic "friendly" AI in the single player campaigns taking resources you intend to use and just being generally incompetent.
They really should have had an option to turn that bullshit off instead of forcing you to either find someone else to play with or making you deal with what basically boils down to another enemy you have to deal with only you can't fucking kill them.
If I had money today, and needed to purchase any of the ones on Steam for some reason I'd just stick with C&C 3 and Kane's Wrath. Alternatively you could seek out a copy of the First Decade pack and get all the classics...and not so classics (I'm looking at you Renegade) for maybe a little bit more money.
They really should have had an option to turn that bullshit off instead of forcing you to either find someone else to play with or making you deal with what basically boils down to another enemy you have to deal with only you can't fucking kill them.
If I had money today, and needed to purchase any of the ones on Steam for some reason I'd just stick with C&C 3 and Kane's Wrath. Alternatively you could seek out a copy of the First Decade pack and get all the classics...and not so classics (I'm looking at you Renegade) for maybe a little bit more money.