One of my readers broke down the STOC accepts by area. Also check out the FAQ sent with the paper comments, though I doubt "No reviewer liked my paper. How come it was accepted?" gets frequently asked.
For those authors of the 234 papers not accepted to STOC: Maybe your tastes don't match those of this committee, maybe your paper is just not STOC-worthy, or maybe life just isn't fair. In any case, don't get angry, just go update your paper with the reviewer's comments and submit your paper to a journal or another conference.