So, in case you thought I wouldn't respond to your little snide remark towards Ami here: You were wrong!
Ami is... <insert character defense here>.
So let's talk characters a bit now that I'm done rewatching the entire run of Sailor Moon, and I'll be talking about them purely in their civilian form. I'll leave discussing who has the cooler super powers or the better attacks to fans of the manga where these discussions belong.
First time I watched Sailor Moon, indeed, I loved Ami. I still do, don't get me wrong, but it no longer is the same. My life simply moved to a point where she's no longer the most relevant of the characters for me, plus the parts that could still be relevant are criminally underused. I really enjoyed watching her fangirl about on the internet in SuperS and in real life in Sailor Stars and being all embarrassed about it when asked, but this happens in three or four episodes out of 200, and she has one episode where she wonders if there's more to her life than what she's currently doing. While this is probably one of the best episodes in Sailor Moon S, and perhaps even of the entire run, it's... not enough. Not any more.
The top spot now goes to Makoto and her attempts to move past being an outsider. Now to be fair to all the other characters, each of them - before meeting Usagi - is an outsider all on their own for various reasons. People are scared of Rei's abilities, think Ami is an aloof nerd girl looking down on them and Minako has all the problems that a girl realistically would have if she for some reason turned into a crime fighting super hero at age 13.
Makoto though, Makoto's issues stem from an unhealthy body image and her lack of self-esteem and self-respect that come from that. That is something that will always stay relevant for me. Not that she gets more attention than Ami in focus episodes, but the relevance of her problems and how she deals with them is present all the time, so hey, here we go.
It makes more sense in Crystal and in the manga (it's there according to the wiki) because we meet Minako like three quarters into Sailor Moon's 46 episodes (man, really, why couldn't they just number the seasons?) and by the time the other Senshi have had a good deal of interaction, character development and fighting as a team. Since they do none of that in Crystal, Minako being sensible and taking up a leadership role makes perfect sense. She stumbles upon a freshly awoken team of girls desperately in need of guidance.
In Crystal, like in the manga, she also pretends to be Princess Serenity until Usagi's memories surface.
Giving Rei a more active role and Minako a more goofball one was an adaptational necessity for the format, having to come up with 4 or 5 episodes between manga chapter releases.