For example, I played the heck out of Civilization Revolutions, Z Origins, Swords and Soldiers, and Bard's Tale on various mobile devices. Those all measure up in fun and complexity vs Nintendo's titles, although most of them are ports of older PC and console games.
I also find it notable that Square-Enix is maintaining relatively high price points for these games (such as $15), and have done so for years, despite the iOS game market still being primarily aimed at the $1-$3 level. Of course, the fact that the games are being published by a well-known name like Square-Enix lets them do things other companies couldn't get away with, but it must be profitable enough because they keep adding more games to their iOS lineup.
I don't know much about the inner workings or much about what people hated (though I've heard some crappy stories), but, at least as far as their Vancouver office goes, it's run by idiots and can't retain talent.
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I looked up DeNa and they look like nothing more than a competent freemium game factory. So I'm pretty much reading this as a play at spreading N's IP far and wide on the hottest mediums. It would be interesting if Nintendo found a way to actually extend gameplay to when you're not on the system, but I'm not getting my hopes up and expect more along the lines of Candy Crush clones dressed as Dr. Mario.