1. Noel, while annoying in gameplay, is the game's heroine, and still has a large fan-base, so their not going to kill her off anytime soon.
2. Noel may be mashed a lot, be she's not the worst kinda fraud to deal with. If you ask me, I would point my finger to Arakune Fraud. (People play keep away until you're cursed then mash the insects and 6C until your dead without using any combos.) It's very hard to deal with, and is actually much more dangerous then Chain Revolver Abuse!
3. Noel's Drive is super risky. She can't block while using it, whifed moves have a lot of recovery, most of them have projectile properties (Characters like Tager eat these up), without Bloom Trigger, Spring Raid, and Assault Through, she's very vulnerable to attack while reloading, and there's so much more.
4. A lot of Noel's specials are situational, and some of her pokes are lack luster when compared to characters like Haku-Men, Ragna, and Makoto
5. Even with very careful use of Chain Revolver, you won't win with that alone. (I know this from experience!)
IN OTHER WORDS
Noel isn't overpowered, and she's still a great character story-wise. I personally think she doesn't deserve all this hate!