Pros
Job security. You KNOW Wal-Mart is going to be there next month, next year, ten years from now... Lets face it, it would nearly take a global cataclysm to take them down. Also, you pretty much have to TRY to get fired. You can be a totally incompetant moron, and your job is still safe. They are always hiring because employee turnover is huge, so getting on should be easy.
Kontras
Anymore, if you have a pulse and can show up to the inverview.... you're hired. This means you will be working with a very random cross section of the population. You don't even need to be able to speak English. Who cares if you cant understand the instructions being given to you, as long as there is a body in the department. Respect for their workers is virtually non-existant as well.