Nerine. I don't have her or her bride version. I don't love her, I don't hate her. Totally neutral paper rating this time.

Stats:
HP: she has the 3rd worst HP from natural rainbow (4th if I counter Alstroemaria but I don't count her obviously). That's not a good thing. Even if she is not a defensive girl.
ATK: Highest ATK of the game with Pink. Good point.
DEF: Her def is okay. Average DEF but enough for me.
That girl knows how to go from an extreme to another. Hopefully, she did it right but her low HP is still a problem, espacially with all thoses super strong pests.

Skill
2.9x damages all, 34% skill rate. Sorry Nerine but it's the same than the other girls. 2.8x dmg, 37% skill is better. But it's still good and classic for a rainbow. Nothing much to say here.

Abilities
Ignores effects from Speed-altering panels in maps.
Useless now. And I wonder if it was usefull at any moment of the game. Lila is enough for it, Dipladenia is good too. And no rainbow should have this kind of ability. Sorry Nerine and Christmas Rose.

+30% ATK for all
It's above the usual buff for all. Not thebest but really nice. Good point for her.

1.36x skill activation
Another good ability. Very appreciable and still rare in the game.

+15% skill damages
I guess it's good? I really don't know how to rate this. On the paper it's not bad but I don't really know if there is any skill damage steam archetype and if it's viable or not. But it goes well with her skill rate buff so, why not.

+30% DEF for all and guts
Not bad because of Guts but not good because it's not usefull. She is not a counter girl or a really defensive girl and it looks just like a bonus ability. Nice to have but not needed.

She has some good assets with her ATK buff and her skil act buff but that's almost all. Nothing really exciting here.

Team Build
Nerine is very flexible and can go everywhere in almost every team... if you don't have better girl. She don't bring really good things aside her skill rate. She can't fit in every (or almost every) serious archetype and there will always be gorls better than her. And I know I should not compare girls but there is also Christmas Rose in the game, very similar with speed panel thing and skill rate... with a way better utility for Crit Team.
Sorry Nerine. You're not bad on the paper and can be great as placeholder but you suffer too much from concurrency.

Conclusion
Extreme stats, good skill and a lot of useless or not usefull abilities. Good everywhere, exeptionnal nowhere. Nerine is not bad but it' hard to find HER place. She can do a lot of jobs (even in some offensive version of Counter Teams) but there is always better girls to replace her.
Like I said, the only team type made for her could be Skill damage team (and I'm not even sure of it) but I'm not even sure it's a real team archetype.

Final verdict:
C Tier because you don't actually need her. It's good if you found her in gacha but there is so much other better girls to choose if you want to build a solid team.
Maybe you will be better in the future Nerine. If devs want it.