Android is better and more useful for having Flash than not. But plugin support in the browser should be made on-demand, or turned on and off as desired.
Even on the desktop (ie OS X) the web becomes unusable with Flash enabled all the time. There are plugins like NoFlash that make it acceptable, and the occasional interesting Flash app makes it worthwhile.
The only site I personally miss is Hulu, which I hear doesn't work on Android's Flash player anyway.