Series felt like it lost it's way after he got to reunite with his previous friends and got revenge so early on in the story. It seemed like they just started adding in different plot points to see which one stuck the best and kind of flailed about for a while.
I thought this was going to be the end of chapter one but if it is the end of the whole series I wouldn't be totally upset I guess. If not, then they should take plenty of time off to try and figure out a cohesive story for chapter two.