Do you activate bad games for the cards?

I play even bad games, I never idle and actually play.

Nope. I may activate games and play them and find out they suck (looking at you, GooCubelets), but I never keep a game that I'm certain I will hate, cards or no cards.

What I normally do is if I get a game from a bundle that I have no interest in playing (whether it has cards or not) I normally try to trade it, but after so long if no one wants to trade for it then I give it away - I'm not gonna waste activating it if I would never use it and it could go to someone else who would probably enjoy playing it.