I started the S10 Blu Ray with The Three Doctors.
Enjoyable story, though not an outright classic in my opinion.
Personally, I think this would've been a good opportunity for a Master story, but the Omega idea was an intriguing one, although Stephen Thorne's 'stageyness' gets a bit a tedious. He was fine for Azal, because it was meant to be a huge, almost monolithic entity; but with Omega it soon becomes a bit irritating and one-dimensional.
People often say it's not a very good story for the Brigadier, and I can see the point when you look at how he started out in S7, but nevertheless I enjoy his scenes in the Tardis and don't find it particularly annoying or out of character, even though he's clearly the comic foil.
It's funny, when I first watched this at the age of 10 when it was first broadcast, I didn't particularly take to Pat Troughton's version of the Doctor. I preferred my Doctor to be deadly serious. And yet I was very intrigued by William Hartnell, whose Doctor I definitely preferred to Troughton. And still do if it comes down to it.
But these days I love the scenes of Pertwee and Troughton together, and even though Hartnell was clearly suffering his age and illness, his scenes are very heartwarming.
All in all, not a bad story. But compared to other stories in this season, it doesn't quite make the grade as a top notch story.
Nevertheless, I'd give it 8/10.