Yeah, I don't get it.  I went into these episodes knowing they were a bit of a fan-favourite and people really like Sil, but this just didn't click for me.  It's a side of Doctor Who I'm never a fan of and does show up in both New Who and Old, where we get this chaotic, unfocused mess.   I wasn't the biggest fan of Attack of the Cybermen but at least there I could appreciate its relative berevity and at least some neat ideas.  Here though, even two episodes felt too long and dragged out to get through comfortably.  I just couldn't bring myself to care about this alien world.  It all felt to low-budget and artificially put together to get me invested in the setting.  Sorry, Vengeance on Varos fans, I am not in your camp.