The apps may have been a bit anemic, but it was early enough that all the app stores were not great. They were certainly hurt by their initial "JavaScript only" stance.

Really painful was that they had exclusivity with Sprint of all carriers. That was a really limiting decision.

I think ultimately the singularly fatal issue was the HP debacle. The initial circumstances of the acquisition might have been ok for the platform. Thanks to some leaked material HP under Hurd actually seemed to have some vision for reinvigorating their consumer brand including an emphasis on former palm products. But Hurd was ousted and that whole initiative was canned and the new leadership killed the product line that they had just bought. Which was the most baffling call, they didn't make room for some other smartphone or tablet platform, they just shrugged and killed off a product that was their only shot at relevance for a clearly exploding new consumer market.