Ah, good news that I am not the only one then.
You can find this strange double system over at EUcasino (andt he casinos belonging to this group), all of NetEnt vp's (casinoeuro, unibet, bet365 etc etc.)
But yes, the 4-card system is x-times better. More fun anyway. The choose color or shape system is just frustrating. If you manage to choose correct color, you double the win, if you manage to choose correct shape, you tripple the win. However, it gets frustrating if you choose heart-shape and you get diamond-shape instead, the same with the black one's. And sometimes one can get heart-shape like 5 times in a row, and when you choose heart-shape, something else comes up instead... So nah, Imma stick myself the 4-card system instead. Much easier, fun and quicker.