I watched 24 and the first season was great. It really as groundbreaking in their willingness to kill any character if it advanced the story and made sense in telling the story. It was supposed to be a 1 season show, I think. Then they brought it back. It didn't take long for it to become a parody of itself and I stopped watching it.
BSG was too much of a soap opera for me. But then I'm not really a fan of long running dramas. I do think after a while you run out of story. Caprica was a pale imitation of it.
Most of these shows, my husband watches so I only watched pits and pieces with him. Maybe I'd watch 5 episodes in a row as they'd feature a character I'd be captured by but eventually they'd stop featuring that character or they'd take it to extremes and I'd get exasperated with the story line.