I'm glad we have the Marie boss, as opposed to no boss. However, it's obvious that right now she does feel very barebo-...ehh...she feels very basic. She's mostly just a series of floating objects that hurl more floating objects at you, so she doesn't bring a lot of personality to the table yet. Yeah, the Vs Series bosses were simplistic too, but somehow they were still pretty fun to watch in motion.
If the day ever came when LabZero could finally work on Marie as a playable character, it'd be nice if they could use some of that effort to tweak the Marie boss as well. Her new Playable Form would be a great way to shuffle up her transformations a bit. For example, Stage-1 Marie could become her new Playable Form, Stage-2 could be a slight revamp of her old Stage-1, and Stage-3 could be a powered up version of her Playable Form with some attacks from her old Stage-2&3. With all of those new attacks and animations to show off, she'd look a lot more stylish while she kicked your butt.
But yeah, we know how stacked the odds are against LabZero right now, so issues with the Marie boss are really no big deal. As annoying as she currently is to fight, at least beating her still feels like an accomplishment, and that's cool.