I laugh anytime someone posts a deal on a bike, because the "holy-er than thou" bike gurus start coming out of the woodwork to tell how bad the bike is. Of COURSE nobody's going to be doing any BMX'ing on this bike. This is a high quality consumer market bike, and a heck of a deal at that. It's like saying "Don't buy a Porsche, because it'll never stand up to running the LeMans".
People in to bikes are a lot like people that are into computers. They tend to build their own rather than buy one off the shelf if they want something industrial strength. I'm sure this bike will handle the dirt trails at your local park or the curbs in front of your house just fine.