I think Affix's are a great creative way to keep things difficult and interesting. I'm already sick to death of the abilities the Skeleton King, the Butcher, and Siegebreaker throw at me after doing them so many times, but every time I find a champ pack (that I don't outgear aka act 1), it's a new set of abilities that I have to figure out how to beat.
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The batman villians all seem to be one big joke that batman refuses to laugh at - SantaRPG