The release of "Survival" on DVD is a chance for old fans to remind themselves, and new fans to learn, of both the best and the worst of the Seventh Doctor.
'The best' about this serial and this period is the story-telling. "The Cartmel masterplan" (as it's referred to in a bonus documentary), which involved making the Doctor's history and character more mysterious and adding a strong companion with an important story arc, really does have more in common with Russell T Davies' quite adult approach of 2005 than it does with the disparate and mostly nonsense stories of the Colin Baker era. When he's not clowning around McCoy's brooding paternal Doctor is one of the best. This serious approach is a chance for the Master to return to his menacing, scheming best.
'The worst' is the production values. Some of the cats look awful, and some of the supporting cast can't really act. As the bonus documentary "Endgame" explains in detail, the production was under serious threat and it appears as though some members of the production team have already given up. Watching the out-takes, none of them are especially funny- McCoy and Aldred are having a laugh and putting a brave face on what seems like a case of going-through-the-motions, as if they are waiting for cancellation.
Unfortunately "Survival" overall is not quite as good as the two preceding stories "Ghost Light" and "Curse Of Fenric", so if you're new to the McCoy era you should check those other two out first.
This is a two-disc set but with a bit more judicious editing of the bonus features, it could have fit onto one disc. Personally I find that the bonus features being added to most of these Who DVDs are a bit too slow, and involve various members of the production crew repeating the same statements too often. For example the bonus documentary "Endgame" is 45 minutes long, but it could easily be trimmed to less than half an hour without losing anything important.