It's an OS focused on email and messaging, with fantastic phone call capabilities. If that's all you're after, great. But for the same $30 data package, another smartphone platform (Android or iPhone) gives you access to more applications, where competition breeds quality and lower prices, a fantastic browsing experience, media services integrated and not just an afterthought, and a development team that understands the trends of the industry and isn't hidebound in 1998. BB's are great at what they are designed for, and mediocre to poor in everything else.
You'd be surprised how fast you'll adapt to a touchscreen, and be loath to go back to a physical keypad after that. I feel clunky typing on my BB9000, and am far slower if slightly more accurate for it. Of all the iPhones I've sold, not a single one has come back because people couldn't get used to the touchscreen. I've had a few people come back after 2 or 3 days, but after telling them to give it 2 weeks and evaluate they come back again saying I was right, they just had to get comfortable with it.