I was a little surprised that when the author said 'accessibility' it meant exposure rather than playability.
I don't have a PC and confining my gaming to consoles helps me actually get work done, so I haven't played much in the way of mods, except for LPB. And the thing about Little Big Planet is that so many levels I've played haven't been tested very well to ensure that the player can just get through the level.
Maybe this isn't an issue with PC mods? It would seem to me that the really successful modders made a level (or a shift) that was fun. Tested and tweaked so players have a good time, and doesn't just look cool.
I mean, sure; all those user created levels on LBP function but that doesn't mean they're playable. The good levels aren't necessarily familiar, they're the ones that are fun to play. The familiar ones-Bioshock, Resident Evil, Sonic themed ones look pretty but don't automatically add to your gaming experience. They work on a nostalgia front and once you remove that the substance frequently is thin, or frustrating because the level wasn't designed for fun, just to look cool.
Interesting article though.