At a glance im not too impressed with Baiken. A unit that needs to apply then detonate dots needs a lot of time to work, which means she'll probably be useless for Guild Wars and Arena content. She may have a niche in pve, but I've already got plenty of solid pve units. Ill have to see a little more from her before I decide to sink a lot of resources to get her. Sol on the other hand looks great for guild wars.
Baiken’s s2 gives an extra turn when it crits so you’re looking at s2 (3 bleeds) -> s3 (detonate the bleeds and cr boost the rest of the team) on her first turn.
With so many debuffers in and entering the meta, I’d expect her to be pretty good.