I think it's perfectly in-character for Aloth not to like Tekehu or Serafen. He's very Aedyran by nature, so I'm not surprised he dislikes the shady pirate and the flamboyant party boy. But indeed, we don't get a "shady" female companion to balance that out a bit, unless the Watcher is played as such.
I can see why Aloth responds well to dutiful Pallegina and Maia, but I was always a bit surprised he approved so much of Xoti's religious fanaticism. Even though she is very committed to her cause - it's all about worshipping a pantheon that Aloth sees in a very critical light, and so I'd have expected him to dislike her religious zealotry just the same way he disapproves of Gina's belief in animancy.
And I wouldn't go as far as to say all male companions are goofs. Tekehu certainly is, and Edér was never the sharpest knife in the drawer, but Serafen? He's pretty sharp and knows exactly what he wants. He just doesn't use fancy words to say it.
My Watcher encouraged Aloth to live with her, and I have to say I like how that seems to play out in Deadfire. I have never seen how it goes on the suppressed path, but during my playthrough the Aloth/Iselmyr dialogue went very smoothly, indicating that they have found a certain camaraderie with each other. I also got the impression that Iselmyr mostly let's Aloth do his thing these days, and that is why he's a tad grumpy that Edér is trying to lure her out more.
I never got the infamous Edér/Iselmyr scene, though. I wonder if that one only triggers as long as you are not in a relationship with Aloth?
All in all, I'm really looking forward to a patch that will fix the companion interaction. I really like their interactions so far and cannot wait to see them "unbugged" and how they were ment to be seen!