I'm completely opposed to the view that bad craftsmanship is acceptable because of time constraints. You are paying for it very dearly, very soon. It is of the utmost importance to write the best code you can from the beginning, and I don't believe it slows you down very much, if at all.

If you've ever seen a software product where something that should take a weekend takes months to get out, it's often not because the problem is more complicated than you'd think, but because of a mangled, complex codebase which prevents anyone from getting real work done.

Edit: Removed a bunch of redundancy.