joking aside, i do feel like a lot of people kind of... pick up the general feeling of asgardian dialogue as Heightened and Melodramatic, but don't look close enough at what's actually going on to reproduce it well.
factor number one is timeframe. mcu thor is not comics thor! there are hints of early modern/shakespearean in there, but for the most part, it's intended to feel timeless. vocabulary that's tied to a specific point in humanity's past is avoided - so there's no thou/thee, no forsooth, etc. of course, they have a dialect - everyone does - but it's a 21st century dialect with an accent perceived as archaic, rather than actual historical speech. (and the accent is doing double duty as an accent of privilege, of course.)
it creates a feeling of history/myth without demanding much of the viewer, and while airbrushing over most of the parts of the past we would see as awkward or comical. it's the speech of an idealised, imaginary past-and-future, which is honestly pretty fitting for a myth.
(in-universe, we could even say this is an effect of the all-tongue: the asgardians' speech is being translated into 21st century english, so the tone and register come through without creating communication barriers. obviously, even magic translation is never flawless: if asgardians do have a t/v distinction (or even more), we're missing it. and i miss it dearly. that could be fascinating in such a hierarchical social environment. but ummm anyway-)
factor number two is directness. a lot of people seem to equate "fanciness" of dialogue to circuitousness, but if you pay attention, a lot of asgardian dialogue actually gets its heightened, melodramatic effect from being VERY direct. every word feels deliberate; they don't waste time. (delivery also goes a long way - it doesn't necessarily look like much once you write it down.)
and sometimes factors one and two can combine, and the slightly-historically-flavoured timeless phrasing is actually a lot smoother and more to-the-point than the natural-feeling 21st century one. think of wherever they use a simple present tense rather than a continuous, where they negate verbs with "not" instead of "don't", where they say "alone" instead of "the only one who", etc.
and similarly, the "timeless" vocabulary can sometimes feel more dramatic because it's so basic and raw. "man" is more powerful than "guy", "child" is more powerful than "kid", etc. even the fact that they call their family members mother, father, brother, the plain words without any softening into a nicknames, adds to this. everything feels archetypical, which makes everything feel mythological. this is THE king, THE father... and THE all-father.
