I've always enjoyed this story. Some of the complaints of the previous reviewers I've considered its strengths - the fact that the Doctor and Peri are sidelined thoughout a lot of the story is an interesting departure and one that allows an exploration of other aspects of the Dr Who universe.
The other characters that take centre stage are fantastic - from the brilliant double acts of Tasembeker/Jobel, Takis/Lilt, Vogel/Kara, Grigory/Natasha (does anyone else think that they're like an alternative universe version of Star Trek DS9's Bashir and Kira?) and of course Orcini/Bostock to stand alone characters such as the DJ (Alexei Sayle!) juxtaposed with old favourite Davros who here shows other sides of his character - in particular dispensing relationship advice to Tasembeker!
It is indeed wrong that the Doctor leaves the planet in the hands of sadists Takis and Lilt, but this just goes to show that he's fallible - and perhaps suffering from a lack of information, having been out of the thick of it for a lot of the story.
This being a DVD, mention has to made of the extras, which do not disappoint. There's a 45 minute documentary "Revelation Exhumed" provides a fascinating insight into the making of the story, and a commentary by Graeme Harper (dir), Eric Saward (writer), Nicola Bryant (Peri) and Terry Molloy (Davros). Odd that Colin Baker is missing from both of these - but perhaps fitting considering his absence from a lot of the story! There are also a couple of features to beef up the story for modern viewers - subtly rendered new CGI effects to replace some of the low-budget eighties clunkers, and a 5.1 surround sound alternative audio track - painstakingly reconstructed using the original audio plus the occasional re-recording of the odd line by the original cast.
There's more too, but I'll leave you to discover them yourself when you - naturally - purchase this first class DVD.