4A Games Chief technical officer, Oles Shishkovtsov has said that the reason they cancelled the Wii U version of Metro: Last Light (sequel to mediocre Metro: 2033) was because the Wii U has "horrible, slow CPU".
However Huw Beynon from the same developer said:
We've heard that the launch day ports aren't holding up as well but then other developers like Gearbox say the Wii U versions of their games are the best looking and even Trine 2 developer stated that the advancements they did to their Wii U version could not be done on 360 or PS3.
http://www.nowgamer.com/news/1687689/wii_u_has_a_horrible_slow_cpu_says_metro_last_light_dev.html
However Huw Beynon from the same developer said:
We had an early look at it, we thought we could probably do it, but in terms of the impact we would make on the overall quality of the game – potentially to its detriment – we just figured it wasn’t worth pursuing at this time. It’s something we might return to. I really couldn’t make any promises, though. We had an initial look at the Wii U, but given the size of the team and compared to where we were last time, just developing for the Playstation 3 is a significant addition.
We've heard that the launch day ports aren't holding up as well but then other developers like Gearbox say the Wii U versions of their games are the best looking and even Trine 2 developer stated that the advancements they did to their Wii U version could not be done on 360 or PS3.
http://www.nowgamer.com/news/1687689/wii_u_has_a_horrible_slow_cpu_says_metro_last_light_dev.html