I wouldn't touch it. Those bikes are never more than $200 used, usually a lot less. Some of them have been recently tuned and freshened up. The price I usually see for that is $80. Someone needs the garage space.
Saves you a ton of money. Add up what it'll cost you to get this thing on the road. Unless you've got a killer spare parts bin, it's going to be more than buying a similar aged bike in better shape.
Btw, even though this is technically a mountain bike, in reality it's a commuter, grocery getter, ride around the park with kids, and cruise the campground type of bike. That's not a problem but you need to be clear about what it can do.