Well, for one thing the "limerick" doesn't scan. I think the first line was a gimme--"limerick" and "There once was a ..." have got to be really, really correlated in the model, so only "model so smart" needed to newly-minted with the correct rythm. The "It spoke with finesse" and "generating success" lines are short, so fewer chances to mess it up (although the "ing" in "generating" is a little soft; I think "generated" would have a better emphasis pattern). The other two lines are just terrible.

Ah, a Google search for 'limerick "finesse" "success"' had a few matching ones on the first page.