Well, Netflix + ISPs are having issues atm so this might be more of an ISP issue rather than wiiU/Netflix Issue and it isn't dependent on how fast your subscription is: (The Video is a bit long but they explain it quite well but you may have to skip to 20:44)
http://bgr.com/2014/02/19/why-is-netflix-streaming-slow/
http://www.youtube.com/watch?v=NWn_BEZYpfA
Basically whats happening is Netflix uses up a lot of bandwidth so the ISPs (Time Warner, Version and etc) have to pay Netflix's ISP (Cogent) money in order to route Netflix traffic from consumers to Netflix and vice versa. So the ISPs doesn't like paying Cogent even though its not very much when you compare how much they make so instead they want to charge Netflix money to pay Cogent on top of what Netflix already pays themselves for Cogent. But Netflix said No but gave them a better win, win, solution, a caching server that basically contains 70% of all the content from Netflix which would mean that the ISPs would no longer need to route traffic to Cogent but the ISPs said no cause they are dicks and instead, they are basically routing traffic the long way around
This is gonna probably start happening to more and more people eventually provided you want to watch 720p-1080p (or lower in some cases) but hopefully its gets fixed
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850
