Poorly implemented how? I see flash on every site I visit, I don't see an issue. Because Apple "claims" most of there browser crashes are related to Flash? Please sir.
Ok, just because you never bother to look at the Activity Monitor that doesn't mean everything's wonderful.
'Out of sight out of mind' is not really a great policy when it comes to computers.
And LinMac hits the mark on the 'hardware acceleration' claims. That only applies to video in flash on certain hardware. Flash has been terrible on OS X in ALL cases, even when it's not playing video.