Strategy. Definitely strategy. I'd love the satisfaction of scheming and planning out some perfect assault and then watching it unfold Just As Planned. Instead, I usually get distracted by building a nice base and forgetting to do things like scouting and building an army. There are individual games I'm pretty good at - I've finished X-Com several times for instance, and I was oddly decent at Rise of Nations and Alpha Centauri back in the day - but just as often I struggle with the first proper level past the tutorial. Or sometimes, the tutorial itself. Depending on how rigged it is in my favour.

I will still be playing Starcraft II though. Because I'm an Idiot.