Myrmonden's Justice League Dark Movie Review (Spoilers)

I really loved the start of this movie as I talk about forever, the scenery was really dreadful and impactful.

The problem this movie has is the ending, the last villain after they defeat the first villain is just so bad.
 First of all its extremely predictable that the standard justice league heroes cant do anything / will be mind controlled. And then its like, ooo he got everything but good tactics and planning so lets beat him with simple tricks.