Man of Honour
The fuss is because you called the beta API embarrassing because it did not work as well as DX did for you. On your quad fire, ivy-e setup using 200% resolution scaling. For most of us, it works very well (despite the ongoing issues with Battlefield 4) so its no surprise that there is a bit of 'fuss' over your claims.
No one thinks Mantle is perfect Kaap. I've listed many of the problems in the BF4 benchmark thread. The main one is the vram usage as far as im concerned. There was a stall issue initially, but that has been fixed for a while now. Yes there are cpu spikes when you exceed the vram limit, but that's hardly a shock is it. If there are cpu spikes in other scenario's it most likely down to the game itself. I think we all know that from the BF4 benchmark thread.
Do you really know what Mantles weaknesses and faults are? Or are you just referring to how its been programmed for by Dice in BF4? Because at the end of the day any fault likely lies with the game itself rather than an issue specifically related to Mantle. If this was the case, then star swarm and thief would have the same issues with vram, would they not?
After all the hype about Mantle it is embarrassing how much better DX11 is than Mantle when using extreme settings. If you check the scores HardOCP managed as I pointed out in another thread they are considerably worse than what I have managed.
Mantle is good in a lot of situations but it is not good in all.