I thought the kids ruined it, mostly because they are rubbish actors, the characters behaviour being so damn cliche and predictable, they also had a bad intro and ending, coming out of the tardis not that surprised being on another planet and at the end of the show simply saying "goodbye" as they walked out.... I also think the cybermen weren't that good this episode either, they are now overpowered and could have dodged the laser blasts from that gun, which also made me think "are they superfast or not? make up your mind!" then again I get that they upgrade individually and whatnot so my only real problem is the animation, I thought the bbc gets paid so much money for the show so why cant the props, cgi etc. be on par with films that premier in hollywood and so on? the superfast walking looked very unrealistic to me.
This series has really dissapointed me, I take it someone new is in charge of the show...