I didn't think Secret Invasion sucked. It was just ok as a Marvel/Disney series. I enjoyed a good bit of it and has it's moments. I'm hoping they'll do something good with Secret Wars. We'll see I suppose.
The last episode of Secret Invasion sucked so bad that it was sponsored by Hoover. The last episode was enough to make the rest of the series sucked. It was more egregious than the last 2 seasons of GOT.