Admittedly, I can agree with this. Taelia could be good because they've never really done much with her. She's a blank slate whose personality can be developed more. Sylvanas' new shift in personality, on the other hand, is pretty banal. People who do nothing but whine about how life is terrible and unfair because bad things happened to them already annoy me in real life - I don't see who would want to hear nihilistic edgelords spewing cringe when they're trying to escape from reality, too.
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Actually, he is confirmed to be straight. He likes Draenei women and Christie further confirmed it.