I -and the missus- love The Americans. It's very nicely done, and very authentic. Still haven't watched the latest series, but I'm looking really forward...
Concerning BSG and the rest, first of all can we stop calling them 'sci-fi'? That's space opera, not sci-fi. Yes, space opera is a sub-genre of SF, but as a huge fan of SF since the tender age of 7 I find there's a huge, huge difference between a space opera series/movie/book and a real sci-fi one. It's like calling a western movie "crime drama".
Anyhow, I loved BSG (the reboot, never saw the old one) despite the space opera stuff. Yes, the religious overtones were a bit too american for me, but the essence wasn't half bad. Oh, and I did love the ending.