Drop it like it was hot (she could never be perfect for me in anything but a superficial way).
Perfect except she’s already married.
Dump her unless she dumps him.
Perfect except her body temperature is 0 Celsius.
As with all things, the devil’s in the details. If the inside of her body is 0C also, then I’m sadly going to have to dump. Think about it…
Perfect in every way, but she has tentacles instead of hands.
I declare my love for tentacle girl! What? She’s just … different, that’s all 
Perfect in every way except she forgets who you are at the end of every day (courtesy of our 50 first dates).
keep her, I can live with falling in love anew everyday.
Flaw: Drug trafficker
Dump.
Perfect in every way, but is a professional bagpipe player and must practice three hours a day.
[del]Bye bye birdie, active felons are not allowed.[/del]
Kept. Bagpipes are OK, we just get a soundproof room.
Perfect, except she tells everything to her mother and best friend. No secrets, including what you did in bed last night.
eta. Damn someone beat me to the punch.
Keep. That’s true of probably 50% of the women I’ve dated anyway.
Perfect for you in every way, except that you discover she (or he) is your long lost biological sister (or brother). There is no familial resemblence whatsoever to creep you out, and nobody else will ever know.
Dump. I have no desire for children with birth defects.
Practically Perfect in Every Way… except, during sex, she thinks she’s Mary Poppins
Given that I have to change that to “he”: I dump RuPoppins! LOL!
Perfect except that his toes are seriously scraggly and he never keeps the nails trimmed. (Nobody sees this but you.)
Keep. If her toenails are the only thing making her anything less than perfect, I can overlook that.
Flaw: job involves travel that will keep them away a total of six months out of the year. Sometimes it will be here a week then gone a week, sometimes here for a month then gone every other day for two months, etc.
Keeper (in fact, that’s quite a plus - I like my “quiet me” time).
Perfect but is incapable of saying sorry, admitting fault or saying thank you. (from the Isamu true stories file)
No thank you. I mean, dumped.
Perfect in every way, but her hair has a life of its own, and it hates you with a passion.
Adios. I can’t fall asleep wondering if her curls are going to wrap themselves around my throat.
Perfect in every way, but she never, ever changes or washes her underwear.
Stankmeister is goneddy gone, gone gone. If there’s one thing I can’t abide, it’s stinky people.
Perfect in every way except that he is highly allergic to eggs and will die if you bring an egg or an egg-containing product into the house or vehicle. (Think carefully, that’s a lot of responsibility!)
Do females count as “egg-containing products”? 
Keep. I like eggs, but I can eat 'em somewhere else.
Perfect in every way, but has trimethylaminuria, a/k/a “fish odor syndrome,” causing their breath and body odor to smell like
rotting eggs, garbage, feces, urine or rotting fish unless their diet is very carefully controlled (and occasionally not even then).
Remember what TruCelt said about stinky people? Yeah. Buh-bye.
Perfect in every way but constantly adjusts the thermostat +/- 5-10 degrees F every day, and disregards all requests to stop.
Keep her
Perfect except-Holocaust denier/“truther”/birther (pick the most objectionable IYO)
Holocaust denier is a dump. That ranks a few levels of outrageous above birther IMO.
Perfect in every way… but honestly believes she can communicate with animals. In a benign way, not in a ‘my dog tells me to burn things’ way.