Well, I use Netflix on my PS3, 360, Wii, android phone & tablet, Iphone/Ipad, 3DS, Vita, and a Roku, and I'd say the PS3 client is easily the best one out there, in both interface, speed, and stream quality.
The Wii U client beats them all, I was shocked at how good it is. You should give it a try.
Know Japanese? Post your advice in the topic below! http://gamefaqs.com/boards/316-gamefaqs-world-japan/63714709