My only complaint is I want high capacity, and I find it so ridiculous that to go from 16GB to 64GB I have to pay $200 extra. Two hundred dollars for 48GB. I think the last time I paid that much for 48GB was ten years ago.
Edit:
I wish Apple would put a microSD reader on the iPad. Purely for storage expansion. I realize they don't do this because it would basically kill their storage upgrade options and they'd probably lose money. No one would feel compelled to upgrade beyond 16GB.
microSD readers exist on the smallest devices nowadays, so form factor or weight is certainly no excuse.