There's already been quite a bit of hype surrounding the way Wayland has been developed over Xorg, see for example:
But a lot of the criticisms seem to stem from the limitations of Wayland right now, whether that's due to design decisions which Wayland have made in comparison to Xorg, or because Wayland has a feature which is similar to Xorg but not quite the same.
Most people seem to take it at face value that Xorg is slow and insecure, etc., with only anecdotal evidence to back it up, and hence just believe that Wayland is better because it has a different design.