@Philweasel
The most impressive thing Luna ever did was probably drawing an entire town into a shared dream (having to
actively sustain all that) and still having enough power left over to hurt the Tantabus a bit.
All of which is related to her special talent. Again I’m compelled to bring up hitting Discord with a sleep spell in the comics, and it working. Luna’s dream powers are actually kinda OP, though in fairness she is occasionally vulnerable to the things inside the dream (though the only things that have ever seriously challenged her are things from Discord’s dreams).
Let’s also consider that the Tantabus was HER creation.
She can also make the difference on, say, beating Sombra versus it being a lot more problematic.
Don’t get me wrong, she’s no scrub. Again going to the comics (where she occasionally gets to win fights, instead of going down like a scrub in five seconds to any edgelord who tries), Luna actually rarely loses. She’s beat Chrysalis handily. She held her own against shadow beasts, well after everyone else went down (Twilight was still a unicorn at this point). She dueled against a heavily powered up Rarity, twice (Nightmare Rarity, and Darkwater Rarity) and held her own both times. She overpowered Applejack and Pinky in a melee.
Luna is strong, but still nothing suggests to me that she would win in a fight against say… Tempest Shadow, Starlight Glimmer, Princess Twilight or her sister.
The consensus is still generally that “Sombra is alicorn-level,” right?
EVERYTHING we’ve seen of him pretty much implies that. Even without the comics (which are… dubious canon for the most part) Luna and Celestia face him together, he never seems scared of them, and he duels final season Twilight fairly competently. He also apparently beat Starlight Glimmer without any difficulty.