I used to use a local Walgreens, because they had a very good tech who cared and did a good job. In fact, I wouldn't even leave film on days he wasn't there. When my guy moved to a different part of the store, I started taking my film to a photo store instead. My point is, Walgreens can be fine, just like all these others, but you have to find a good person and get to know him or her.
By the way, I found it fairly easy to find a photo store that had prices as good as Walgreens, with excellent quality. So I really would advise you to check prices at photo stores as well.