Getting tired of this criticism. The '90's and Crystal have about equal characterization, the '90's just had more episodes thus more opportunity. Let me give you an example. After Mako blasts the living crap out of Nephrite and starts to explain about her past, there's an interesting moment where Rei nods and says it's good Mako had more reason to come to Juban than getting over a lost love since life is too short to waste on moping over some guy. It's a great moment between Rei and Mako as both have had disappointments in love (if they had just animated Cassablanca Memories...) There's more with Mako, like how both Mako and Rei chime in to tell Mina that yes, of course she'll look suspicious carrying around a giant sword.