What is you opinion on the Eminence?

I honestly wasn’t particularly taken with it as an ongoing villain in Dark Eyes, it’s just a gas that makes zombies. Maybe I’d feel differently if I’d listened to its other stories, where it doesn’t have share anatognist role with the Master.

Without joking, it took me two listens to actually get a grasp at the origin story.

The only Eminence story I've heard was Destroy the Infinite. I found it pretty forgettable, and as such, I've forgotten it.

I can't tell you what I thought of the Eminence in Dark Eyes (I'd have to revisit the series, it's been a while), but I really enjoyed them in The Seeds of War. I'd daresay that Seeds may be my favourite Six/Mel story. Mainly, down to two things:

1. Firstly, we get to see the immediate consequences of the war with them up close. The Earth Alliance won, but if Ridius IV is any indication, that didn't mean much. There's very little left for people to celebrate beyond the destruction of former monuments to enemy powers. It's a hard existence, filled with starvation and inequality, and it's getting harder. Worse, the Eminence may not have been annihilated as they claimed, after all. So, if there is another war, the Alliance isn't equipped to handle it.
2. Secondly, Colin Baker's performance. The Eminence is an enemy that thrives on its reputation in that story and he really sells them as a terrifying threat. It's so rare to see the Doctor genuinely panic, so it sticks with you. Their defeat feels as though it comes only from his wisdom, at this point in his lives, and it's by the skin of their teeth.

For Destroy the Infinite... Origin stories are tricky little things. To use a random example from the character of John Constantine, there's many a mention of a place called Newcastle. It hangs like a spectre over his appearances in Swamp Thing. Something bad, bad, bad happened there. We only get snippets here and there, but it left Constantine a gibbering wreck for years and destroyed his team. It's a great bit of backstory... but when we see the event in the flesh, it's not really done justice. The imagination turned out something far grander. In that instance, for Infinite, I just didn't buy that this was what made Sixie so scared.

So, maybe it's a bit like Halloween. Strong original entry and strong idea, but the sequels didn't quite hit the notes they required.

I loved the vocal i admit

I feel like it was a missed opportunity. Lots of nice setup. I liked Destroy the Infinite and Seeds of War, and their appearances in Dark Eyes 2 & 3 were quite good, despite Dark Eyes' narrative cohesion problems. And then Dark Eyes 4 happened and... it all just fell apart.

I had a fan theory, that the Eminence was the ultimate form of the decayed Beevers Master post Mastermind, a distilled mist housing an evil consciousness, the only thing left at the end of time until The Doctor shows up and triggers a spark of recognition that causes it to daisy chain its way back in time and start possessing people en masse. And the reason the Time Lords have sent MacQueen to deal with it is, well, fighting fire with fire, really. And MacQueen wouldn't remember being The Eminence due to the whole "only the most recent version of a Time Lord will remember the events of a crossover event" thing. Yes we saw the beginnings of the Eminence in Masterplan, but the Master's mistform could have easily been added to the mix turning it into what it was.

The convoluted technobabble and its ultimate "oh it's just the daleks again, really" conclusion was a let down, to say the least.

Forgotten all about it lol

Wasn’t too impressed by ‘Destroy the Infinite’ and I thought its backstory was just unnecessarily convoluted.

Or a rematch... *scratches chin thoughtfully* Does The Seeds of War mention that he's only met them once before or is it a bit more vague than that?