My first MC character has been an absolute blast! Believe me I understood what I was doing when I made the decision, and I didn't make it lightly. We are playing mostly by the book but our DM has injected some homebrew into it so it's not balanced like traditional 5E is. However for me if I do MC it is mainly for story reasons, I treasure my immersion and if it makes sense then I'm more likely to go with it. I've played mostly single class characters so I was a little jarred by MCing at first, but once we gained a few levels and my character advanced far enough in his second class he went back to his first class and stuck with it.
Yes I know I sacrificed my high level abilities, but I really considered what mattered to me more: To have a fourth attack, an asi and survivor? Or to have rage, unarmored defense, danger sense, reckless attack, spirit seeker and totem spirit? For the character I had in mind the latter was more thematic, plus my character's niche is best described as calm fury. For the most part he keeps a level head, this is due to that mentality being reinforced during his army days. However he had been denying his more savage nature, the lower part of his reptilian brain so to speak.
So he's part disciplined, veteran warrior, part ruthless, ferocious and savage fury all rolled up into an older man whom has had a reawakened passion for life. I couldn't really have made this character possible without MCing, only other way was if I had a DM homebrew me an alternate solution, then again they could just straight up deny it.