I will give the benefit of the doubt that since she's new, people might not know her stats, but when it's in a thread that had datamined stats posted and people raving about how she's the best archer with 35 attack and speed where even a -Atk or -Spd Cordelia is at worst, a normal Jeorge, Klein, and Takumi, it's kind of hard to say she's not good because she's -Atk or -Spd.
Anyway, there was a thread about it on Serene's Forest questioning about the obsession with boon and banes. It's just that there are people out there who only care about winning and get really picky about stuff. And I just read post yesterday about how Charlotte and berserkers in Fates (and maybe in general) are absolutely worthless because of their low accuracy. A response to that is sometimes you just have to gamble and Charlotte winning those bets means she hits hard by critting everything. It's not just Heroes or Fire Emblem if being on Smashboards (or existing and being conscious of stuff in general) is any indication of how people can be with characters and stuff.
On Serene's Forest, there is one user who, for whatever reason, keeps summoning -Atk units. It's scary and amazing how she summons most of her units as -Atk, but she gets by despite this. I think she had -Atk Ike, Soren?, Titania, and she just summoned a -Atk bride Cordelia today. She did get a duplicate Titania who wasn't -Atk, but still, when most of the 5* summons she gets are -Atk and she can still play the game without much trouble, it does question if maybe people are going a bit overboard with all of this.
I still stand by that -Atk is the worst thing in Heroes, though. Some units can deal with it or ignore it like Azama, Cherche, and bride Cordelia while others suffer like Felicia, Niles, Olwen, Rebecca, Setsuna who already have low or borderline low attack and/or whose attack or other stats can drop by 4 instead of the usual 3.