That's not really a good off road bike, as it has very old school MTB geometry. It would be a good street cruiser though.

A lot of Nashbar bikes are really good quality, they just don't have the name brand associated with them. If this bike has old XT (Deer Head) components on it, it probably is a nice bike despite the missing canti bosses, easily worth $40-$50, and as good as the bikes from the name brands you mentioned. I totally would have picked that bike up for that price: bull moose bars + biplane fork = cool.