No, of course not. Plenty of people have ridden and are riding plenty of miles on ALL of those bikes.

The OP's question was not "Can I ride lots of miles on a department store bike", it was "how to avoid Wal-Mart bikes", which means he's trying to get a better understanding of what used bikes might be worth putting a little money into fixing up and restoring, either for his own use or to sell for a profit, and which ones to avoid, because they have a reputation for being less well-built and are worth less money.

Like I said in my first post, "there are exceptions" and "YMMV".