Flash-based sites have been a craze since the past few years, and as Macromedia compiles more and more features into Flash. Flash-based sites have been become arguably, disputed to be bloated and unnecessary.
A standardized site
With Flash, you do not have to worry about cross-browser compatibility. No more woes over how a certain css code displays differently in Internet Explorer, Firefox and Opera. When you position your site elements in Flash, they will always appear as they are as long as the user has Flash Player installed.
The bad and the ugly:
The Flash player People have to download the Flash player in advance before they can view Flash movies, so by using Flash – your visitor range will decrease considerably because not everyone will be willing to download the Flash player just to view your site! You’ll also have to put in additional work in redirecting the user to the Flash download page if he or she doesn’t have the player installed.
Apple / iOS Apple and Flash don’t play well together. Try to visit a site that uses flash with your Iphone or Ipad and you’ll soon be frustrated. Simply put you can’t use Flash on a stock iOS device. Are you willing to ignore all of your customers that own Apple products?
Site optimization If your content was presented in Flash, most search engines wouldn’t be able to index your content. Hence, you will not be able to rank well in search engines and there will be less traffic heading to your site!
Loading time Users have to wait longer than usual to load Flash content compared to regular text and images, and some visitors might just lose their patience and click the Back button. The longer your Flash takes to load, the more you risk losing visitors.
The best way to go is to use Flash only when you absolutely need the interactivity and motion that comes with it. Soon HTML5 will eliminate the need to use Flash altogether. Otherwise, use a mixture of Flash and HTML or use pure text if your site is purely to present simple textual and graphical information.