I totally agree...... Except the steel series controller (which is also bluetooth) displayes an unsupported accessory error on the ipad 3 (and other older ios 7 devices) according to several people who tried it on toucharcade.
http://forums.toucharcade.com/showthread.php?t=204136&page=110
I am not sure if it that particular controller, or a general limitation of ios 7 on the ipad 3 that caused the problem. I suspect it is ios limitation vs the controller maker's implementation, but who knows.
It could be a simple bug as well that ios 7.1 will correct.
These are the only devices work with the steelseries:
iPhone 5-5C-5S
IPAD:iPad 4,iPad air,iPad mini
IPOD: iPod 5gen
The funny thing is that people have used the ps3 jailbreak controller add-on with the ipad 3 works fine when an official ios controller won't....