This is not Gintama. I mean, it has the same story arc and the same characters, but overall it felt like another parody sketch, overextended by mistake. The animation style is probably the main culprit. Then the action, pacing, story, soundtrack. When it was over, I was left with a feeling of "Wait, is that it? Where's the real final?".
Animation style aside, it felt like this was just a hastily put single story arc finale, made by a different studio, rather than a proper Gintama finale. I mean, every time I saw these generic "anime eyes", I was like w t f. All the presentation aspects of it are different from how it usually was in Gintama. And those aspects, for me, were one of the defining parts of what was Gintama as a show.
So overall, 2 silver balls out of 11.