I'll just preface this by saying this seems to not meant to be the series finale. I totally understand people thinking that it was meant to be, since that is what we were told by Adult Swim (maybe the show got canned who knows), but the Warriors specifically say they've still got big work to do.
Anyways, as a SEASON finale this ticks all the boxes. Tasteful callbacks that serve a purpose to the plot. Massive and well foreshadowed changes to the status quo. A great resolution to the seasons main arc.
And last, but not least, a good climactic battle. Now that point is especially important because, quite frankly, if you follow Genndy Tartakovskys work you know that climactic battles like this one are by far his weakest point (and there are still ways this battle could've been improved mind you).
Anyways, I will confess i am more excited for Primal season 3 than season 2 of this, but this still had a pretty good first season even though it had some problems.