Service Model by Adrian Tchaikovsky is so good. Hilarious and brilliant depiction of a robot protagonist, with probably the least amount of “I'm going to make them a sympathetic character by making them partly human and not actually a robot” of any robot story I can think of (I mean except murderous, paperclippy ones).
Its moral lesson eventually lands with a hell of a punch too.
So good.
(Also, I think “Adrian Tchaikovsky” must himself be some kind of robot, or perhaps a writing collective, because it's impossible for one person to write so many books so fast and have them still be so good.)