I think it's insane that some companies hire people after only a single cursory interview. In a startup, a new hire is one of your biggest expenses and has a tremendous impact on the company. Not to mention that you're probably going to spend more time with this person than with you're significant other. Plus, it's a lot harder to break up with an employee than with a girlfriend.
Even the typical "gauntlet" seems like too little to me. I'd rather spend several weeks working with someone before hiring them, but unfortunately that's not possible.