J.R.
I have never shopped a wal mart for food - i don't have one nearby.
I do have an Aldi though. I have to say, I get a strange rush from saving that much money :) Sometimes their stuff is even better than the name brands. Their meat is good, (I use their boneless pork ribs to make my italian red gravy - it adds a meaty flavor) their cheese is good - love their grated parm and romano cheeses), dairy and produce all very well.
I find that sometimes I still need to make a trip to the Jewel for some things. there isn't a huge selection of produce at Aldi, but what there is, is very fresh. We don't like the Aldi pasta (my italian family is very choosey on this - and it will not be compromised - Barilla... must be Barilla). When I have shopped at Aldi and managed to get everything i need for the week, i can spend about 75-80$ and walk out with a LOT of food.. the same amount would have cost me an additional 100$ at Jewel - EASILY.
Few notes about Aldi - you cannot use a credit card. debit or cash only. and you bag your own groceries. bring a quarter to 'rent' your cart, you get it back when you return it to the front of the store.
i especially love Aldi for stocking up on cereal, and lunch snack items like jello fruit cups, granola bars, chips, etc.
Also - they do have special purchase items that are the name brands you are used to seeing, but cheaper. not a ton cheaper, but definitely cheaper.