That's your opinion, but Maul has done pretty well in the Clone Wars, and basically made the season. I agree with you concerning Mace Windu though, I think this guy just needs to stay dead.
Amazing that people cant just accept that people die, pisses me off tbh.
It ruins every single franchise out there, with all this coming back from the death nonsense.
(Bringing back the Emperor was also complete and utter @#!%?£$ which completely disregarded the point of the entire Star Wars saga - however I don't reviving Maul and Fett had such a major impact)