1) Big, Ugly Bezel.
2) No Multitasking.
3) No Cameras.
4) Touch Keyboard.
5) No HDMI Out.
6) The Name iPad.
7) No Flash.
and) Adapters, Adapters, Adapters?.

Update: Why stop at 8? Here are more things we are discovering that suck about the iPad.
9) It’s Not Widescreen.
10) Doesn’t Support T-Mobile 3G.
11) A Closed App Ecosystem.
12) And more…

More information [Gizmodo]