There has been almost no major technology to emerge since the debut of iOS that is really dependent on Flash. Zynga and Hulu were the last major players to emerge with prominent Flash utilization, and they've heavily invested in iOS since. To the contrary, iOS exclusive (at least to begin) apps like Angry Birds and Instagram have captivated the tech press and public imagination.
Really, as an iOS user since the first gen, I don't feel left out of anything. To the contrary, iOS continues to get the best stuff first - Kindle, Netflix, the latest iD and Epic games, the best social networking clients, the best new games that people on other platforms clamor for (Angry Birds, Cut The Rope, etc.).
Both Farmville (60+ million users) and Mafia Wars (45+ million users) have been ported to iOS.
Or ported as in "You have to do X,Y,Z"?
If it's the later, I don't think it particularly matters. Most people just want it to work. They consider a browser should function as a browser.
http://itunes.apple.com/us/app/farmville-by-zynga/id37556266...
Most people are going to want to go to a website, and have it work. A native app doesn't cut it.
Flash is actually coded by chipping if-thens and loops into stone tablets for all of time.
http://itunes.apple.com/us/app/farmville-by-zynga/id37556266...