Nothing exemplifies RIM's troubles like the Playbook. Introduced in 2011, this tablet was plagued with buggy software, a poor and limited app selection, and even lacked native email support at launch. Initially, you had to tether a BlackBerry phone to the slate to get your messages and calendar. Seriously. While subsequent updates to the OS have improved matters, the PlayBook's 2.3-percent market share is mainly attributed to drastic price cuts. Last time we checked RIM's stock lost 74 percent in the last year. BlackBerry 10 couldn't come soon enough.