This was Troughton at his best. The story was very long, and in places, felt like there was a bit too much running down the same corridor, but the concept was very new, and very well handled. Ignore some of the kitchen-sink angry-young-men acting that was fashionable at the time (The Dominators is a prime example of this), but Troughton comes across as an actor enjoying himself, and we all share in the delight.
The War Lords are a nasty bunch, and you know as soon as you meet them that the Doctor has to defeat them, albeit at a very high cost to himself. Once you learn the rules by which the war games are conducted, Troughton blusters his way past the innocent victims of the War Lords' plan, and makes this story a pleasure to watch.
Despite the frequently excessive prices being asked by collectors for this set, and my dislike of the low quality of VHS compared to DVD, this will nonetheless be one of the VHS Doctor Who stories I have to buy, unless the DVD makes a welcome appearance some time soon.