i work at a petsmart and honestly, i think our department is run well. ive had bad experiences at all sorts of pet stores including other p-marts, wal-marts, meijer, petco, psp, etc but i think it all depends on the store. dont write everyone off just because the tags are wrong and such.
we actually got new tags for all our fish recently and i guess there were massive complaints from the aquatics specialists in every store about misinformation on the tag. basically the petsmart max size usually refers to how big the fish will get in a captivity by the normal fish keeper, not how big it can truly get in a 1000 gallon tank.
and yes, they changed the names on several fish thinking that if the customer couldnt pronounce the name of the fish, they wouldnt ask to buy it. and theyre right. i sell more featherfin catfish and dinosaur eels than synodontis cats and senegal bichirs. so yeah i agree that a lot of big chain stores suck but a lot are also really good depending on who runs the department.
if you dont want to learn you wont last long in my store, bottom line. i make sure you get moved to another department or train them to death because i hate when customers are misinformed. so give the big guys some credit...sometimes.
also i got a really sweet spotted raphael catfish from walmart once and it lived 12years so i guess theyre not all bad eh? :x