I'm running 12.04/amd64 perfectly on i3 and i5 machines.
Considering the bewildering variety of hardware out there and all the testing manufacturers during the beta phase (no, just kidding - they do absolutely nothing to help) not that many people got hit by the bugs mentioned. It depends on a carefully aligned stack of bugs that's easily removed by changing one component.
Obviously, Ubuntu is not for some people. For all others, it works.
Considering the bewildering variety of hardware out there and all the testing manufacturers during the beta phase (no, just kidding - they do absolutely nothing to help) not that many people got hit by the bugs mentioned. It depends on a carefully aligned stack of bugs that's easily removed by changing one component.
Obviously, Ubuntu is not for some people. For all others, it works.