This is the kind of comment that gets under people's skin. Did you not get real money for working on a real project? Maybe to you it wasn't "real" or as important as your higher paying job, but I assure you it was real to everyone who contributed and everyone who's waited and watched this for years, mentioned adding a review system to their own members, etc. Also saying you don't use xenforo anymore is completely irrelevant to the point of a paid project being left before it's complete.
I commend Daniel for taking the project back and doing his best. I know that if I had to take on 2 years of someone else's code, debug, etc, I would be pretty annoyed. Complaints notwithstanding, I would still be a custumer when this is finally done (if it's done in a reasonable time-frame).