Drupal's lack of object orientation, confusing user-interface and administration, weird nomenclature, and the fact that it really is (despite what their community may tell you) a content management system makes it a non-starter for me. If you're into PHP, try something like Symfony or Cake.
You can use Druapl for many things. If it is what you are familiar with and will allow you to build something fast and iterate quickly, go with it until you have need/find/learn something better.