The Q10's battery life is great, the hardware keyboard is solid and travels well. The Paratek antenna gets the best reception and data connection of any device I've ever used. The BB10 software isn't great, but it's decent. (It's certainly far better than where WebOS / iOS / Android was when they launched. Even today, BB10.2 is significantly better / more powerful than Windows Phone 8, even if the UI is less well defined).
Their story, to me, seems almost down to timing. They're executing pretty well right now, it's just two to three years too late.
It will be sad to watch all that hardware die. In a year or two, there probably won't be any devices available that have a large battery, solid hardware keyboard, and decent cellular data reception.