I never make my challenge, but that's partly because I always set it to 365 (a book a day) and then just see what happens. I like it, though.
The reviewing slows me down a lot, too. And my writing... Never enough time in the day, it seems.
Loving the Calibre suggestions in this thread. Thinking I make have to backfill some stuff...
I never get the hate on the Reading Challenges. The whole YOU READ SHORT BOOKS TO PAD YOUR TOTAL seems kind of hysterical strawman to me. I mean, I'm all about the sky is falling panic, but getting upset over a Reading Challenge just strikes me as odd.