It can't be much worse than the bug-ridden Flash runtime which is horribly slow and has generations and generations of compatibility hacks trying to provide, ex

It can't be much worse than the bug-ridden Flash runtime which is horribly slow and has generations and generations of compatibility hacks trying to provide, except the 2D vector graphics, pretty much the same functionality as browsers and JavaScript do. This is a good thing: Adobe/Macromedia's expertise on the authoring tools combined with a good open platform instead of their proprietary backend. I have no complaints against the former, and if the latter will work out it's just a plain good move.