It would be fun if you could put your pet on a treadmill while you yourself do other stuff. But you would think they should also be able to lose weight somehow.
LGR just loves the sims too much, he isn't able to give any criticism because he worships Will Wright. But I Like LGR because he shows some obscure ideas of Will Wright of the past like Sim Copter and Spore.
In sims 3 there were band groups, you could get together with friends and play music, it wasn't bad but i didn't make much use of it. But yeah maybe the idea that you could go to a concert would be fun.