well the tvs they have are "okay". not the best, not the worst. their customer service however is total crud and getting parts for one if it breaks isnt going to be easy. you can compare them to vizio, toshiba and all the other "mid tier" brands
getting parts for sony is really easy. i believe its also easy to get parts for samsung and i believe possibly lg. other brands... mid and low tier brands? not so much.
best buy salespeople typically have no clue about anything. they only go by what they think, hear or what their training tells them. my cousin was a television repair tech for 20-30 years and personally owns a LG and adamantly stands behind sony and samsung as well. he knows how hard it is to get parts and quite frankly its a big issue for most brands. its better off just replacing the tv when it fails.
of course... if you wanted to replace the tv anyways instead of fixing it.... then go right ahead and buy vizio, sharp, toshiba or some other brand.
i'm not trying to be mr negative against sharp... i just personally like to buy something i know can be fixed if need be. i dont buy disposable electronics.
if you dont care... then go right ahead and buy sharp. its an average quality brand (mid tier).