Me - I swear like a trooper. I don't believe that it's indicative of a limited vocabulary, but rather acts as an augmentation to it, and can be a great emphasiser and emotional release, as well as sometimes even being funny. I am also struggling to think of a single time that "bad language" has ever bothered me in literature, film, TV or theatre. In fact in the hands of a master such as David Mamet it can be positively exhilarating. It kind of gets on my nerves when I read reviews complaining about such language as unnecessary or offensive to their delicate sensibilities. It's part of our language, and so it should be reflected in our dramatic media.
Why am I telling you this?
Well I've not read Asimov's original books, though I doubt they're littered with F-bombs. Also I can't recall hearing any swearing in the first season of Foundation. But suddenly this season every character seems to be F-ck this and F-ck that, totally out of the blue, and (I can't believe I'm writing this) it really grates. Everyone sounds like a child experimenting with new swear words, and it keeps pulling me out of the show because of how unnatural it sounds and how ubiquitous it seems. I know that Empire's behaviour is corrupting due to genetic pollution, and the first Foundation has evolved into a much different kind of society, but Gaal has pretty much only just woke up from some kind of cryo-sleep/hibernation. It just doesn't feel as though it's a natural part of anyone's vernacular - especially after the first season.
Like I said, I'm a pretty big fan of "foul" language, especially when used creatively, emotionally or humorously, but this just feels forced, like some executive producer decided, "Right! We need more f-cks to make this more relevant!", and it just seems so out of place in "high" science fiction such as this.
Other than that with regards to the show, so far, so flipping good.