It appears that part of your problem is that you are putting the iPad and laptop into the same category when in reality, they are completely different devices. I know; I did the same thing. Sure, you can upload your files to DropBox and install a VNC client on your iPad but at the end of the day, it will always be a 'Pad; not a laptop. When I stopped trying to make my iPad a laptop and started enjoying it for what it is, I began to see what a cool device it really is.
I have a MacBook Air, 27" Apple Cinema Display, iPad 2 and iPhone 4. The ACD stays at the office because that's where I do the vast majority of word processing, spreadsheet, number crunching etc. I seldom open the 'Air when I'm at home unless I bring work home with me. The vast majority of computing, including reading and responding to this post, takes place on the iPad. I much prefer reading and responding to email and web stuff using iOS on the 'Pad. It's more comfortable to me. Also, the apps I use most often on the iPad (Flipboard, CNN, Zite, Pulse just to mention a few) are much more enjoyable on the iPad. The iPad also comes in handy in the car. I have a mount for it and use it for GPS, music and Internet queries. The iPhone? I use that primarily for making and receiving calls and hotspot creation. I should also mention that I keep all media files (music, pictures and movies) on a 500 GB external HD that's about as big as my wallet. ...but I digress?
So should you keep it or ditch it? My advice is to use it for what it was intended to be for a couple weeks *then* come to a decision.