Ever since it was released, the 5D3 appears to have received more criticism than praise. Canon in this case did make many people feel betrayed by cutting corners on a number of things, the SD card being one of them. This is not the first time they did this (remembering the AF on 5D2) and they will continue doing this. So are many other companies. Unless someone does it differently, by including all the best features on a second of the line product, we will have to accept the reality. I just hope Canon would not quickly abandon the 5D3 within a couple of years or so.
You can't please everyone, there will always be critics. I don't know if I'd call it betrayed, what were people expecting? You only can put so many features on a 2nd tier camera, you have to draw the line somewhere. That's why there's the 1 series and the 5 series.
Betrayed - by putting the twin cards of the top of the range 1D4 in the 5DIII
Some people's expections are so unrealistic
Wait, all the 1DX owners will be betrayed too by the 5DIII stealing the AF system.
Just link metering to the active AF point in the 5D Mark III and now you have a betrayal!