I gotta 100% disagree here. People have adapted to online dating and online communicating in general and are EXCELLENT at hiding their insanity. Sure, many put it out there for ya, but many do not. You'd be amazed at the true stories about a lot of people you prob think are normal or "nice" just on EF.
And the big problem here is the physical part of it. Sure, you can always wait til the first meatup to determine that part of it, but then you could just be wasting your time. NEVER judge by online pics either.
Pros and cons. I see nothing wrong with it if you know what you're doing.