It could have been worse like Jar Jar's brother was revealed,lol.

Maul's race are not exclusively Sith some have been Jedi.

They could have just introduced another of his race as a sith apprentice, Maul having a brother is something ridiculous only Lucas could have come up with, or fanboys.

Why would they emperor need Anakin/Vader if he has another Maul.

The clone wars has consistently crapped all over continuity even more so than the prequels which is surprising.

I have for the most part enjoyed the animated series a lot more than i did the prequels which were garbage. See if other writers and artists are involved star wars is better, what ever was crap about clone wars i attribute to Lucas solely. The people making these are fans of the old films you can see the love is clearly there.

I mean even bioware's star wars EU stuff is better than anything Lucas has done since before after 1983 for star wars.