Do you mean, as a color tablet? The Fire is, but it's more of an Amazon consumption device than a true tablet. Do some research before you go that route.
I really like Kindle Fire, because it adds flexibility among my other devices. For me, it makes more sense to have devices from various platforms, from diff manufacturers, because I can do more overall. But if I could afford only one tablet, I'd still stick with a 10" tablet. For real work, I still need PCs, though. For me, no matter size or maker, any tablet really is a consumption device.