Revenge of the Cybermen wasn't bad, but it was pretty boring.  Though there were strong moments of suspense and tension early on, it pretty quickly devolved into a very boring series of flat-feeling scenes of boring dialogue.  Maybe something about the planet of gold could have been done in an interesting way with the Cybermen, but it really feels like that wasn't achieved.

The reuse of sets from Ark in Space wasn't a bad idea.  It's a good use of time travel to save a bit of money in a way that wasn't necessarily a creative hindrance.  Exploring the same setting, especially an alien and futuristic one, across an extended time period - that sounds very interesting.  Yet that feels like a piece of trivia in Revenge of the Cybermen more than an important or relevant plot point.

Still, Tom Baker and Elizabeth Sladen do a lot to still make this a fairly pleasant viewing experience.  I'm not so sure Harry stood out as much in this one, but it's still a fun TARDIS crew and I was having some good fun before the third and fourth episodes kind of bored me.