I kinda really like tablets, if I go outa town for business or a trip, i generally just take the tablet (my asus transformer, which is awesome and you shud go buy it).
Yeah, its not real practical in a sense of actually doing work on it, i.e typing a lot, although the asus comes with a dockable keyboard and then just attach the mouse, which then I could do all sorts of work that i could do on my PC.
Also tablets are great for just leisurely stuff. Sure if you're into big end games, you don't use the tablet, but for casual gaming, there's tons with fun games on android, and with the tegra on asus, pretty awesome games.
Also I feel that grabbing information is so much faster on the tablet due to all the apps. Just one click and bam you got what you need, stocks, sports, news, email, etc. Swipe here, swipe there, look at this , look at that. It's just more fluid.
Of course the PC, at this day and age, isn't replaceable just yet.