Well that's good at least.Teeny tiny one that I saw. Very small. I pay attention to this sort of thing and have to write, this isn't bad at all.
I seem to recall they established his magic doesn't work against the TVA? And that they are not "normalish" humans?ITMT: I am bored of Norse G-ds karate fighting normal humans. Loki's physical strength is on par with Thor's. He is using magic, so that isn't nullified. Anyone normalish human should be a plaything for him. Any gang of them should be an amusement for him.
Trying to recall if Cap harms him in Avengers (They tussle briefly). I think Cap had to be saved by Iron Man.
In Avengers, yes Cap did lose to Loki in a 1v1, but that's not really a good metric, because later, Cap is able to hold off 5 Stone Thanos just by sheer Beard Power and being a Determinator. As DBZA said "Power levels are bullshit!"
It's always going to vary based on the needs of the narrative. Plus there is nothing at all wrong with the idea of people being caught off guard, surprised, previous opponents getting stronger and learning from past mistakes, and people becoming weaker, or less focused, making them vulnerable when previously they weren't.
As to everyone doing martial arts in movie fight scenes....*shrugs* I mean it's what is popular, it's what the stunt teams are trained in, it's the standard method of doing fighting, so it's just logical, IMO, that they stick to that.