The Verge gives it 9/10. Takeaway quote:
The Paperwhite is an excellent reader, probably the best I've used. Between the new display, the improved software and performance, great battery life, and Amazon's massive book selection, there's not much here to complain about. Some may nitpick the lack of a charger or the fact that you need to pay to opt out of advertising on the device — and those are negatives to be sure — but the overall picture is very clear. Amazon wants to make great reading devices for the masses, and with the Paperwhite, they just took the game to a whole new level.