I was rejected for medical inadmissibility (excessive demand). I filed in Federal Court and was granted leave, but because I'd been in Canada for many years, I'd met someone and married so after the rejection we started a sponsored spousal application.
CIC pushed through my second application very quickly and the same day they issue my PPR (sponsored spousal) I discontinued the JR filing (about three weeks before the scheduled hearing). While I cannot prove anything, I think CIC had reached the same conclusion I did - they were going to lose the JR application. So while I didn't get a court decision saying they were wrong, I didn't have to spend another 12-18 months after winning a JR application going through the same process all over again.