Flash isn’t so great on ANY platform. While it gives a semi-convenient development tool, particularly for games - it is a resource hog, a security hole the size of Alaska, and is still quite unstable.
I have seen brand new computers with LOTS of RAM and high-power processors brought to their knees after dealing with Flash for any length of time.
There are times that I wish my iDevice had Flash... but then I open a web page on my desktop or laptop and am reminded why it is a good thing to not have it.
add to this issue the fact that Adobe STILL hasn’t developed a 64 plugin for 64 bit browsers, and I am among those who would love to see HTML5 replace FLASH completely.