What is a champion that's "fun to play against"?

I always hear people mention something/someone "not being fun to play against" but I quite legitimately never see anyone say that something is "fun to play against" And that's not even an exaggeration Is this just a blame philosophy created by players so they can feel better about their loss? I don't understand
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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