I always thought Anderson's live action shows were poorly written but looked great, as opposed to stuff like Blakes 7 which was written fantastically but looked like crap.
They did make an effort on the writing front, though. When I watched UFO not so long ago, I was expecting something silly and lowbrow. I was surprised at how dark and dramatic it was. There was the one where the main character had to make a choice in the Earth's defense that led to tragic consequences for him on a personal level. There was the one where they let an attempted murderer go free and strike again in order to preserve their secrecy. There was the one where the main sexy purple-wigged female character from the Moonbase, who'd basically just been eye candy up to that point, turned out to be in an interracial romance, which was a very daring story at the time.
I don't feel the show really worked all that well; the writing could've been better, and the characters could've been deeper. But it was definitely aiming for a much more adult demographic than Doctor Who was.