[NO SPOILER] Ok so how bad is ending really?

Never seen any of the fourth season. Hear the ending is universally disliked.. how repulsive is it? Should I just read the Wikipedia episode summaries, conclude the story for myself or should I actually go through the whole season to get the end?

Are we talking HIMYM, GOT, Veep level bad?

Or is it just overly controversialized

Thanks