Good, but not perfect.
Firstly, they wasted all of last season to what should have led to this. As others have said, this should have been the season finale last season. I don't think his new family was really needed. And even after all that, this episode felt rushed. We spent most of the season with that stupid virus, got two episodes of Governor backstory and then BAM, prison invasion.
Also, why would the Governor kill Herschel and not Michonne?
It was also lols watching Tyreese hide behind a thin poll and still avoid getting shot.
The stupid kids are annoying. Obviously the crazy one is dissecting animals.
They already did the "getting split up" thing after the farm fell.
Still, I enjoyed it and was on the edge of my seat so it still gets an 8 from me.