I can see why you wouldn't feel the need for an iPad, if you already have a kindle, iphone, netbook and such... But *hate*?
I like my iPad. I don't use it as much since I got my iPhone 4, but I still use it plenty.
There's nothing like an iPad to read comics, PDFs (guides, magazines and such). All my RSS feeds on google reader can be easily read on an iPad.
Plus, it has a couple of entertaining games.
Also, I can watch football while my fiancé happily reads her emails, web surfes a little and play Treasures of Montezuma (an incredibly addictive game) on the iPad.