Honestly we give Oni so much shit about his code quality, but this game is frankly the only one that I've seen that has attracted such a large community in terms of modding.
Oni's game is the only one where the writing is SOLID, the art is good, and the characters all feel like they're alive. One of the only simulation games out there that is so fun, the "domination" route actually makes sense, the "love" route is sweet.
In terms of programming, I rather have someone like Oni that tries to write code and subsequently get better at it, then some of the other programmers that use RPGMaker, does an average job, has TERRIBLE art, and TERRIBLE writing.
Point is, yes, code quality might be poor, but everything else is unique. Only other I can think of that's interesting is Eva Kiss's Good Girls Gone Bad. Summertime Saga has ugly ass art, not-sexy girls, and stupid looking MC.