1) Motorola Droid Pro for sure.
2) HP Tablet, or maybe not.
3) Windows Tab 8?
4) Any netbook released since 2010.
5) Google Nexus One phone. I don't know much about this one, but I guess it's a turd.
5) That Blackberry flip phone. It was an unnecessary bridge from flip phones to smartphones.
What else?
(http://www.maximumpc.com/article/features/16_worst_failed_computers_all_time#slide-0)