As many of the more recent reviews (Dec 2018) have stated, the last season (eighth) wasn't very good nor was the seventh which was when the show began its downward spiral.
I have downgraded my original score of 8/10 to 6/10 after seeing the conclusion to this story, so that shows you how much I disliked the end.
I'll leave this spoiler free, but just say the ending goes against the ethos pushed through the whole show that Voltron wins as a team and not as individuals.
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