Walmart bikes are built shoddily, put together by people who could care less if the rear derailleur hits all the gears (I know this for a fact as I worked briefly at a large box store as a bicycle assembler and I was the only person in the store that could tune a derailleur, and I used to get into trouble for spending more time then everyone else on the bikes), the rims are usually warped right out of the box, the welds look terrible (on most) and the components are the lowest grade junk that they can get their hands on.

If you really want to give biking a shot I highly recommend picking up an old cruiser. Most come with racks and fenders, have components that probably won`t fail as quickly as the new plastic crap that comes out of box stores, and with a little elbow grease and a rattle can paint job will last you for years and years and years, or at least until you decide whether or not biking is for you.

The other plus side to this is that you`re giving a perfectly serviceable old bike a second life, plus you`ll have a way more unique ride than the Wally world special.

That`s just my opinion though, I`m sure there are several people here who have ridden Huffy`s for 20 years and find them to work great...