Groupon, the online coupon discounter, is getting a lot of criticism over a commercial that aired during Super Bowl XLVthat used Tibet and the rain forest as its subject matter.
"It's been exceedingly effective," Miles Nadal, chairman and CEO of one of the largest ad agencies in the world, MDC Partners, which owns Crispin Porter, the firm that made the Groupon commercial, told CNBC on Monday.