I've been working on setting up ROM Collection Browser in XBMC. (Maybe I will someday do a blog entry about it. tl;dr it's way too goddamn fiddly and not nearly as simple to set up or change anything as in XBMC's video browser.)
One of the problems is that games do not have dedicated sites explicitly intended to be scraped for pics, metadata, etc. (at least, none that are ready for prime time yet) and it scrapes from places like MobyGames that are clearly not intended for this purpose and have ridiculously long-winded descriptions that you then have to edit down.
But you know what I really hate? Descriptions that start with, eg, "Phantasy Star II is the sequel to Phantasy Star." NO SHIT. Thanks for spending 50 characters explaining that to me, asshole.
(In fairness, helpful hints like that ARE a great approximation of an 8-bit JRPG.)