Yep, if they're done well, then they're a good addition to the series. :]
Even though it's not anime/live action, I liked the Hana Yori Dango Live Action. Densha Otoko and Himitsu no Hanazono were also pretty good, but I didn't care much for the Cutey Honey and Sailor Moon Live Actions. I think they used a porn star for the evil villain in Cutey Honey..
I guess if it's more of a real life/school life kind of setting, it's okay, but the mech and magical girl ones are kinda bad.. Those should stay on paper, hehe.