I believe the issue here is one of causation vs. correlation. It's true that Titanfall, Watch Dogs, and Destiny were all disappointing, and it's true that they were all cross gen. The trouble is that's those are about the only similarities they share. All of them were disappointing for entirely different reasons (Titanfall for being too short, Watch Dogs for having an extremely generic and bland story with some unintuitive "hacking" mechanics, and Destiny for some misleading marketing and not innovating in any significant way). None of these problems can be traced to being last gen: length is an issue of simple work, poor story writing and unintuitive gameplay design has nothing to do with console power, and misleading marketing certainly has nothing to do with what generation it's on. While they all share the similarity of being cross gen, that's all they share.
