AT they are going for a total cast break in the end however they are being smart about it with a slower introduction to the newer cast bit by bit.
Browder is not much like O'niel at all if you actually look at the two characters Mitchell is still very haunted by his injury during the Antarctic fight and is still very unsure of himself, O'niel was always sure of himself even after the whole his son killed himself deal.
Browder is also a little bit MORE flyboyish then O'Niel in the sense that he seems much more skiddish about being in a ground firefight for example when T'ealc tried to shoot through that door and Mitchell goes "Whoah, woah woah!.....bullets BOUNCE" and jumped around. O'Niel wouldn't have done that.
Now as to Atlantis I like it but they are still busy trying to grow the characters so we'll have to see if they can ever manage to settle the characters in to their respective personalities.
As far as BSG goes yeah it's a long term drama not an episodic show, as far as the "language' issue goes well they are military and most of them are "sailors" to boot which btw are renowned for having a foul mouth. And it is as far as I can tell pretty accurate to real world military as most of the navy and marine folks I've met cuss a LOT.
As far as Frack vs Frell, well Frack is a throwback to the old show but this time they actually make it sound like a cuss word where back in the original series it sounded more like someone saying "Dang".
And the real F word is hardly pretty so I guess they figure FRACK should be just as ugly sounding so I like it
