Nothing to add there. Maggoth Riders are terrible. 40 points less gets you a Lord of Affliction, who has a frankly better mount, better weapons than two of the three Maggoth riders, buffs Blightkings and Pusgoyles without having to use a Command Ability, has a Command Ability that is less worthless than that of Orghotts Daemonspew and who is basically as tough. Oh, and since the LoA isn't a named character, he can go nuts with artefacts and traits to make him even better. It really pisses me off too because I love my Maggoth. I put a lot of effort into the colour transitions and the wounds and boils but using him means actively gimping my army.