Did you find that they have far less capability than a laptop for a much greater price?
... but it's a cool new toy
Tablets are no doubt cool toys - e.g., for a number of reasons, they may represent the best gaming platforms available. However, they are far more than cool toys. They are capable of a great many things and facilitate many uses that were previously functionally unavailable. The uses that are being developed for them are revolutionary and the convenience, efficiency, mobility, and flexibility (not to mention the economic feasibility of specialized use development) they offer are incredible. Education applications. Enterprise applications. Gaming applications. Content delivery applications. They are truly changing the way things are done, and largely for the better. In ten years, the idea of not having tablets - and what they mean for the way so much stuff is done - will be nearly as unthinkable, and seem nearly as limiting, to us as the idea of not having internet is to many now.
It is true that much of what tablets are currently used for (though certainly not all of it), laptops are capable of. It is also true that laptops are capable of some things that tablets aren't, and are meaningfully better at other things than tablets are. However, there is a wide range of things that tablets - the good ones, at least - are far, far better at. It isn't always about capability - about what something can do or can be claimed to do - it's often about how well it does it. I use my tablet for so many things that I used to use traditional computers for (even when I'm in a room with computers), because I've found that it is much better at them - the experience is more seamless, or easier, or quicker, or fuller - and so do the people that I know that own tablets. For that matter, I often use it in place of my TVs - sometimes even when I'm in my living room with the 50" flatscreen (if I'm the only one watching). It's better - the image is bigger (as it presents to the eyes) and the video goes where I want, when I want, instantly.
I have a friend who is a construction supervisor - he uses an iPad and, he tells me, it has greatly increased his efficiency. He tells me that, since seeing how he can use his, a number of the other supervisors in his company and his boss have bought iPads of their own. It wasn't feasible for him to lug a laptop around from job site to job site, and the way they operate is just slower anyway - finding stuff and opening stuff on a laptop is time consuming and awkward at times (I realize that many laptop users don't sense that yet, but that's because they haven't experienced the new, better way of doing many things that tablets represent). His iPad doesn't just replace his laptop either, it replaces the paper notebooks he used to have to lug around to make notes and lists and draw sketches. It's a top of the line GPS. It allows quick viewing - and manipulating with your hands - of images and plans. It makes his job easier and makes him better at it - and this is in the construction industry, of all things.
People that think of tablets as just (inferior, if that be the perception) laptop replacements are missing the story and much of the point. They are not pure computer replacements, they are something much different. Something less in some regards, yes; but much, much more in others.