I've always liked the design. As a Jewish kid, I also like that he's Jewish and son of a rabbi.
Besides that, I like that they play around with the identity issue. To me, he's sort of like a mash-up between Batman and Christopher Chance from Human Target. So it's like with Moon Knight, you have a Batman sort of archetype. But what if Batman was slightly more unhinged?
Like when I think of classic, iconic Batman, I don't think psychopath. Yeah Batman certainly has issues dealing with a childhood trauma, but I always think of Batman as a really well put together straight arrow guys. He's always in control. He always knows what to do. With Moon Knight, it's like you have a Batman-type vigilante, but he's more unpredictable. He's borderline schizophrenic if not completely schizophrenic. You don't know if the whole Khonshu thing is real or if it's just some wild scenario he's fabricated in his head.
IMHO, if there was a TV series, it should always keep you guessing if what's happening is real or if it's all being made up in his head. Like it should mess with your head

. Like give the audience a bit of a feeling of someone who is suffering from personality or mental disorders
Also does Moon Knight really have a massive fandom behind him? I'm not sure I would say he does. I think he definitely has his share of fans and a niche fanbase at least. I would say he's less popular than Daredevil. It's just when I think massive fandom, I think Deadpool. Even before he got a movie, Deadpool's fanbase had grown rather large.