A good sedna/Queen in a team can really help. But I think there isn't a lot in games because most people just want lot of kills and the rare sedna you meet are built with attack skills. But you always need a good healer, whatever game you play! And she's so cute 
But now, I prefer a good player with another Dg than a bad sedna that can't heal and support you 
EDIT: For leveling, when full healer, you need some combat creeps with you I think, an teamup with others.
