I do just about everything I can to not walk into a Wal-Mart, and on the rare occasions I do, the self checkout there is notably worse than basically everywhere else. There's something with the way they have it implemented where it just doesn't work right.
Most other places it's okay; it feels like it has improved in most places; I remember when it used to be pretty bitchy about placing items in bags and whatnot; in fact it seems a lot of places have stopped making them talk, which is a huge plus.