What an animated discussion this is! I do shop at Walmart for fabric. There are three stores nearby but until they "brought back" the fabric, only one had fabric. Now all three have it, but I still buy at only one of them. I love the quilt of the month patterns they offer and have collected them for years.
As for the quality, for the most part, I've been very happy. The fabrics I choose have good weight and they do not fade, as someone suggested. One irritant was the discovery of a logo hidden in the fabric design of the fall prints. As far as comparing them to LQS fabric, I've seen the exact same fabric sold at Walmart offered at local LQS and by quilt show vendors. The exact same, not first run. The only difference was it was twice the price.
I am a thrifty shopper so I never pay more than $3/yd at Walmart. If it's $5-6, I leave it there until it comes down in a month or two. A few months back I made a great score at Walmart when I found some fabrics that were marked $5 for the bolt! It wasn't cotton for quilting - one was a heavy satin finish rayon that was perfect for making pouches for the veils I make and the other was a cotton/poly blend with a nice texture that I used to make napkins.
As for the service, that leaves much to be desired. There used to be a very friendly woman at the counter, but I guess she retired. Now, in general, there is no one. However after watching workers from other departments who can't figure out how to use a telzon - if there is one around - I now cut my own. All they do is take a sticker from a drawer, write the price per yard and the yardage on it and that's that. So if I can't find anyone, that doesn't stop me.
I also shop at Joann and love their red dot sales and coupons. There are a couple of LQS that I stop into on occasion, but the fabric looks like it has been there for decades and talk about flimsy! Thank you, no.
To the Walmart workers who have posted on this thread, I just want to say I'm sorry for the Walmart bashing.