No, and especially not for that price. Companies like Mongoose and Next tend to make bikes which aren't meant to last. Their components are cheap, their frames are heavy and weak with poor welds, and the forks (if it has suspension) bottom out easily and are often not adjustable. These bikes are disposable and simply fall apart. If you're really going mountain biking you're better off looking on craigslist for a used entry level Trek, Giant, Gary Fisher, Scott, Kona, etc. All of these make excellent entry level models which hold up for a long time. My first bike was a Trek 4100 and when I sold it (after 7 years) it was still in great condition.
Added: I work in a bike shop, and I can show you all sorts of broken axles, seized bottom brackets, seized hubs, bent derailleurs & hangers, and all sorts of other failed components from cheap bikes. Nothing new at that price is going to be a good buy.
The suggestion to rent one is certainly a good option if you don't think you'll be biking enough to justify spending lost on a quality bike. Good Luck - I hope you find something that works for you!