God, no, it's not at all okay for a show dog @LandSharksAnonymous Genuinely had no idea about it grumbling at dogs etc. Not good... But slightly not surprising at the same time... (tries to be tactful)
We've met quite a number of TM over the years. They are mostly calm, quiet but very aloof, same as Kangals, similar vibe. Quite intimidating up close. You sort of say "lovely dog" and ask about it, but you don't try to cuddle it. They're not outright aggressive, just very imposing. Far more so than other breeds of equivalent size, including our own. Met one locally a few months ago when Brie was little, would be interesting to meet him now but I think she'd poop her pants tbh, given that she thinks she's a tiny Catbeagle.
Although I say LGD can be "sharp" and they can, it's not so much that they're openly aggressive, because they kind of don't need to be. They don't throw their weight about, it's more a "don't mess with me" sort of vibe. It's hard to describe. So no while we don't okay it being aggressive, we kind of get it. If that makes sense. Does it? As a show dog, not normal, as a working dog, normal-ish...
We (me and my parents) had an Anatolian. Beautiful dog but I wouldn't have another unless I had a lot of land. It's a much more primitive breed than PMD, they really need to be outside, working. It's just not an urban/suburban pet which a PMD can be, if you have the commitment. They're amazing, Anatolians, I love them but they need a mentally stronger owner than me. I'm a LGD lightweight truth be told.