I have mixed feelings seeing Project Spark called a cancellation. I had easily 50+ hours of playtime into it across the various projects, and the constant stream of content and improvements kept me happy. The subsequent Conker content was interesting.
The service was eventually stopped, but they went out of the way to make it a free experience by the end, to improve the tools, and to
effectively refund the purchase price for those who bought content for it. I got some weird/interesting/fun/impressive experiences out of it. Aside from the predictably stark gap in quality among different people's content, the game delivered.
Project Spark ran like shit on xbox one and wasn't fun, in any case.
There was actually a major performance bump that came along with with the patch-parity update from the PC version.
Fable Legends had some good tech behind it, but man, that was a terrible project goal for a traditionally
single-player story RPG.