I dunno if several of those are really disasters. I was a big fan of the powerbook duo, just never had the cash for one (but then, I was in jr high...). The newton was a great product, just ahead of it's time, and, IMHO priced above the threshold to get people to come out and buy them. People who had emate and newtons swear by them, as well as cube owners.
The lisa and mac portable though? Yeah, they kinda screwed those up... Big time...