I'm reminded of when Fallout went from RTS/RPG to FPS or "Action RPG".
I guess you're talking about the turn-based combat of the first two Fallout games, but RTS stands for Real-Time Strategy, which Fallout never was.
I didn't mind the perspective shift in Bethesda's Fallout games, and while there wasn't a fully fledged turn-based combat option, at least V.A.T.S. let you slow things down if you weren't that into fast-paced shooting. I do feel like the writing, and consequently, the role-playing took a significant hit after Bethesda's acquisition of the franchise.
I have relatively fond memories of 3, although I've never replayed it since its initial release. 4, on the other hand, I've tried at least three times to play through, and I always end up giving up and uninstalling. The simplified dialogue system and lack of nuanced options just kill any sense of immersion or investment in the world. I don't care about crafting my own little wasteland town, I want to actually give a shit about the story and characters.
Anyhow, this is all off-topic—I really have no interest in a StarCraft FPS—so pardon my rant, and have a great day and/or night.