Yes, Mario Kart is, though its a bit easy to figure it out because Waluigi & Daisy are in them to find the answer easier to solve. x)
I'm not a big fan of sports in real life myself, but I find Mario sports to be exclusive. Though games like baseball, soccer are a bit of a bore, Mario Tennis & Mario Golf are definitely very fun. There are so many things you could do on your own & its a buttload of fun playing with & against your friends as well. Mario Sports Mix & the Mario vs Sonic Olympics games are the only ones I have never tried yet. Any opinions on those one?