Yes it's true that you _can_ win fights with
Cutey and if you win the round and your opponent doesn't do something against her 4 damage and ability, then she greatly rewards you for it.
The problem is that you still need to win the round with her and I have to insist that 6 power, even in conjunction with SoB simply doesn't do it. Of course it's not as bad with Kenny since she is only a 3*, but I'd rather get a lifegap of 6 out of
Pan or 5 damage out of
Edwin (or even 3 damage with
Sargh!) than to gamble on her.
Consider the case where you deal with an 8 powered card without a relevant ability.
Edwin draws even.
Sargh is slightly ahead (except in extreme cases). Until your opponent goes 7 pillz,
Pan will win with an additional pill, but you will need to invest 2! more pillz in
Cutey once your opponent invests 5 and it only goes worse from there.
And seeing how newer cards are subject to power creep, I doubt
Cutey, or Nighmare in general, will be able to keep up.