Ni No Kuni punishes you for getting further in the game with it's boring, not fully thought out and ultimately broken mechanics. But at face value, it's a beautiful game, with outstanding level of detail, it's graphics are just simply superb and does psychologically make you want to continue despite it's bad level design (twisty corridor galore - think Eternal Sonata) and extreme levels of padding (think Skyward Sword only worst). It's understandable why Yahtzee quit, he got about as far as I did before I returned the game out of frustration.
The first 12 - 15 hours of the game could have made a very smooth 5 hours if they created a better tutorial with less padding in the gameplay, because yes, the first 15 or so hours are a bludgeoning tutorial, implemented worst than even Final Fantasy XIII, as it holds out important survival mechanics as long as it can, such as, as Yahtzee described, the All Defend ability and that's not good enough.
Personally as a JRPG fan, I felt this game will actually do the JRPG industry further harm if it continues being as popular as it is; and it has no good reason to be as popular as it is, as the only reason people ARE buying it, is because of the Ghibli name associated with the title. As with all things, brands don't make a product magically better than others. Although technically released first, Ni No Kuni has no place on the market in a post -Xenoblade world and any game that doesn't try to be at least to the standard of Xenoblade is surely to fail, so when a lacklustre title that fails in almost everything it set out to do, tries to one up the superior title and somehow gets more recognition, you're entering pop market mentality / territory (ie: Call of Duty) here.
Publishers will see that Ni no Kuni sold better with 170,548 copies sold in it's first week than Xenoblade Chronicals with 161,161 copies sold in the entirety of 2010 (about a 6 - 7 month period) and will insist on more games like Ni no Kuni and less to the standard of Xenoblade because that's good business. As-per-normal, people will then complain about how stale the genre is and then blah di blah di blah, aeternum repetit.
Well that rant when longer than expected but that's how I feel about the popular title and sorry to Susan Arendt for all the crap she had to deal with for reviewing an over-hyped title (on JRPG standards) before anyone had the chance to play it and see for themselves that the game is as she says.