Should Big Finish have given Six a definitive ending?

For me, I was always content either way. I knew Big Finish would do The Sixth Doctor justice (and they did! ), but I was also content if there was never a direct follow through, either.

I was very happy with The Last Adventure, and grateful they finally gave Colin an exit for his character worthy of his calibre as an actor. (And equally grateful that he didn’t choose to retire at the time)

The Brink of Death is a great end for the sixth Doctor and didn't limit Big Finish using the character in the future at all.

I'm listening to The Brink of Death at the moment and the character of Genesta (played by Liz White) sounds very much like a certain Jodie Whittaker. She gets to call Valeyard 'the knacker's yard' and The Doctor even says she reminds him of him! It's quite uncanny.

As someone who always wanted Colin (not the Sixth Doctor, but Colin) to get his chance at a proper regeneration story, which had for various reasons been denied him, I was very happy indeed that Big Finish finally did so. Especially as I don't believe that Colin would have agreed to it if he didn't think the proposed storyline was up to scratch. So I was really looking forward to it at the time, and had faith that it would turn out well. And in my opinion, it did.

It may not be the greatest regeneration story ever told, but it was certainly a worthwhile one, and really, that's as much as I could ever hope for. A proper, quality story to send the Sixth Doctor on his way with, and that gave Colin the opportunity to put a nice full stop at the end of his vastly underrated Doctor's era. An era that long may it thrive, with many more adventures set before that Last one to come our way, for hopefully a very long time indeed.

I personally liked the set a great deal but I'm more glad Colin got behind it - he'd been resistent for so long that knowing he finally was OK with doing "the end" was cool. And most importantly the stories were all good, and varied. 

I don't see any major argument against giving him a definitive ending - BF wanted it, Colin agreed.

My one issue with it was the format. I would have infinitely preferred something more in the style of a TV story – either a four-parter or a six-parter – and felt using the boxset format for something that should have felt like "the story we were meant to get" was a dubious choice.
That said, the story is very good. It's just my small issue with it.

I think I prefer how they did it. I liked how they used the four stories to have the Valeyard be the common threat thread that runs through Sixie's entire life.

It would have felt more definitive and standard, rather then an event, particularly for new listeners if it'd simply been a four-part adventure with Mel. Telling the story of Six's end across four special hour long allowed the various ongoing plot threads to still feel relevant, while emphasising that while this was his 'last' adventure, there were still more stories to come.  Big Finish walked an incredible tight rope with The Last Adventure:  giving Six an epic finale for fans who had only experienced Six through the TV series, as well as honouring his years of development at Big Finish, as well as telling a story that would appease both vocal fans who wanted The Valeyard to return (I WAS ONE ) and be part of Six's narrative at Big Finish, as well as fans who didn't like the character.