User Problems:

These generated passwords are even more meaningless and thus are even harder for a user to remember.

Although many users don't, users can choose secure but still meaningful passwords. For example, someone might choose the password ``~(k1)^2Frt" which looks fairly meaningless, but makes sense to the user:

~	is a tilde - a squiggle that reminds the user of her first pet, a ferret
(k1)^2	represents the ferret's name, which is Kiki.
	k1 looks like ``ki", and (k1)^2 is mathematical short hand for ``k1k1"
Frt	Is the user's short form for the word ``ferret"

But it is much harder to come up with a justification for a randomly-generated password than from a difficult password that you have created.