People surprised at the hate/lukewarm reception, let's look at the factors:
-The game no longer features the unique artstyle and personality from the initial concept video
-It has been admittedly focus grouped with 12 year olds who thought it looked like something their kid brother would play.
-It's a full priced, generic looking game late in the generation.
-This... This of all videogame ideas is what they went multiplatform for.
Now, fix the first point, and it would have a visual flair about it that demands attention. That would also nullify point #2 in the process. And since people take notice of the design, so too do they get hyped about the world and story of the game. Insomniac feeds off that positive energy and recycles it back into the game and we no longer worry about the third and fourth points because we all want it. We'd have gotten podcasts and juicy media detailing every nook of that stylish world and we'd all be waiting in line on launch day. Instead, we got numerous amounts of damage control and reassurances and even self-referential in-jokes about people disliking the product in marketing material.
I feel bad, I really do. People here got quite excited about that God Mode game because it came out of nowhere with a style that is what it is (as opposed to "not quite what it was when first shown") and has a budget price on download services. If Fuse looked like Fuse when it was Overstrike and was announced as a budget download, I'm sure no one would fret... actually, there'd be that whole "this is what they decided to make as their first multiplat game?", situation.