1. The OS's interface is "linear".
2. There's no multitasking
3. There's no accessible filesystem.
4. There's no camera.
5. The screen gets smudgey.
6. It doesn't come with a screen cleaner.
7. The speakers aren't loud enough.
8. It's "not portable".
9. It's hard to read in direct sunlight.
10. You can't get it wet.
11. It has too many book suppliers and no unified book reading interface.
12. It costs $30 to turn it into a picture frame.
13. It has no USB port.
14. You can't replace the battery.
15. There's "no ability to create content".
16. It costs $100 too much.
I found this to be a distinctively superficial and unhelpful review, but it was at least mercifully free of moral judgements.
Since (1), (2), (3), (4), (5), (10), (12), (13), (14), and (16) were clearly evident before he bought the device, and (8) and (15) are... dubious... at best, I find it especially amusing that he opted to pay for it.