i dont recall much 360 backlash.
Also where have you been? There's been tons of NX backlash, most of it has died down by now since the system was announced over a year ago.
Also consider that Xbox was a great console with good support, people don't feel the same about the Wii U. Lots of non Wii U owners are looking to the NX, it's a chance for Nintendo to win people over. There are fans like me who love their IPs and are waiting for a system worthy of a purchase