Mark was my least favorite character too, he really didn't add anything to the show
Exactly. You want someone who hates fun? Ron. You want someone boring? Garry (much less boring than Mark but still not the most interesting passionate person in the department). You want someone who never gets what the crazy people around them are on about? Ann. Later, Ben. You want a straight guy? Ron again. You want someone selfish? Tom.
Everything he offers (very little as it is) is covered already. Fuck Mark.
I agree, plus also anyone who sleeps with Leslie Knope and forgets about it is not worth even a single drop of Snake Juice.