Wyll is so very, very dull and talks about himself in the 3rd person, Halsin is both dull and lecherous. Karlach is like an irritating teenager. Gale is a pompous arse.
Dull AND lecherous? Not a common combo, but it definitely describes Halsin. As for Wyll, he definitely got shafted quite a bit in terms of what he can provide. As for Karlach and Gale, I love em both but I understand why some don't.