I loved the formal nights. We don't often get the opportunity to get so dressed up. It was fun. I think it's a very special evening, and I must say, must husband looked fantastic in his tuxes, we also got some great pictures. I would be very disappointed if they didn't have formal nights as many of the other cruise lines. It's all a matter of choice, if you don't want to participate there are other dining options. Our daughter (14) is coming with us for the first time next year and I think she's most excited about the formal nights, she wants to go get dresses now!
BTW, smart casual on RCI is a sport jacket and tie for men (according to their web-site).