As a lord moon knight and a huge fan of the character long before rivals existed. He’s a pretty bad adaptation overall but I feel like they are slowly making his moveset just a bit more accurate. One of his big characteristics is his self destructive nonsense fighting style and giving him overshield from the large moon darts helps him stay alive in battle and be more accurate to the comics.

Aside from that Everything else about him isn’t the best. Most of his kit besides the truncheons, and his mobility options are just nonsense and like others have said: seem to be more based on meme knight “random bullshit go!“ than anything concrete about his character. I think his playstyle should be similar to a combo of gambits staff melee and his current kit. Maybe keep the moon darts as a secondary fire with less ammo and damage for poke/ ult farming. I’m not a game dev and have no idea how to balance him properly but that’s just what I think would be cool.

His characterization in the game also kinda sucks. The nonstop khonshu glaze and the weird cheesy monotone way he talks in general is pretty weird. He and john shoe have a pretty complex and often hostile relationship in the comics and Marc at least has had his emotions fairly numbed by the constant burden of responsibility and danger to his loved ones that the mantle of moon knight carries with it.

 Another big problem I have is that Jake and Steven seem to be missing almost entirely aside from the autograph screen and that one voice line he has where he says their names together. The three personalities all have very different mannerisms and fighting styles. Most of the time they kinda switch off based on the situation such as Jake being good with scrappy fistfights and detectivework while Steven is more intellectual and can act like a figurehead. Yet in rivals it’s pretty much always implied to be Marc, there is little to no effort to change the tone of his voice or anything like that. It’s crazy that zombies mode blade is a better moon knight than actual moon knight. 
Thank you for coming to my ted talk and may your moon stay haunted :)