In the same vein, one could claim use of humans to write code was a mistake. After all, the project failed, this means they made a mistake, so obviously they should have used trained hamsters instead. Do you see where your logic failed you?
If you use or have used StackOverflow or Newegg, realize that you too are using Windows. Projects' success and failure is much more correlated with the folks running them than the technologies they use.
Sorry, a database-backed web app works just fine on a Microsoft stack, there are thousands of them out there and I say that as someone who vastly prefers unix but this is clearly a project management fiasco and architecture design fiasco, not a technology stack fundamentally unable to handle the demands.
