I'd say if the Walmart bike is in your budget go for it. It gives you a fairly inexpensive way to try out a new sport. Just realize that if you really get into riding, you will want to upgrade as you learn what you like/dislike, but if you don't you haven't spent much money. My wife now rides a carbon Domane, but her first bike was a Trek Hybrid which she got into riding and 6 months later wanted the roadbike.