I adore that about my LS SI. Father to his men but if you're on his bad side. Welp was nice knowing you. That said you often have hard to try to get on his bad side so it's not like they weren't warned. And I do like how he and Theron butt heads it adds a bit of spice.
I don't really like my reps with Theron. It's...a bit dull for me tbh unless it's my DS Reps and even then I'd rather they be with Lana. (Lana and Smuggler I adore together almost as much as I love my Agent and Theron.) And yes I do love how the game give syou different ways to play. I did DS SI and while I didn't like it as much as LS SI it was pretty interesting and I see why people like it. (I just like my sassy heart of gold LS sith more).
Edit: As for disliking Satele yep count me on that boat too. My Si feels the same way about her as he does that goon on Alderaan. Emotions lead to the DS his behind as he would say.