Than explain why crysis 3 was complete for Wii U and not released?
Money.
I have seen many games that were "complete" but never taken to market. The last set of development hoops -- getting first party certification -- can cost many hundred thousand dollars. Marketing for a major title costs millions more. The cost to put all the discs in shrink-wrapped packages costs money. Distributing those shrink-wrapped packages to stores costs money.
With only 3M consoles shipped, they probably figured it was better to mothball the project rather than throw more money at it.
Many game developers with decades of real-world experience can count their cancelled projects into the tens and twenties.
What about frostbite not compatible for Wii u but for 360 and ps3 and even mobile?
Again, money.
To port an engine from a functioning X360/PS3 code base and push it down to Wii-U's processing standards is a considerable effort. I don't know their team specifics, but I can easily imagine it costing in the $3M range. Moving to mobile is a complete rewrite, so it is a different story.
Why FIFA 13 a copy paste of FIFA 12 on Wii?
Again, money.
Look at sales numebers,
FIFA Wii doesn't look like it has many customers. Compare the 0.7M Wii customers to the combined 10.4M on PS3 and X360 (which can share assets).
Would you invest much of your money in something that will only see 0.7M sales, or would you spend it on the 10.4M sales?
I think EA has some beef with Nintendo
Me too.
I think they are upset that Nintendo isn't helping their revenue stream very much. I also think they are upset that Wii-U didn't sell very well because that caused several projects to be mothballed.
Like I said, the "tantrum" is really just in the eyes of the OP and a few others who are not taking a broad view.
EA simply said that they have no games in the pipeline for Wii-U. As a business decision I find this very logicial. Why target a system that even if you sold a copy to every single console owner you could only get 3M copies (and realistically will see less than 1M sales), when you can hit 10M or more on other consoles for the same effort?
Some people didn't like it, started slinging mud and vitriol, some random game programmer made a comment, that comment got picked up and the mud-slingers treated it as official, etc.
It is a big deal out of nothing.