I have never been bothered by stretch marks, i guess if it was really extreme it would be ugly but yeah ive never seen a really bad case of it.
cellulite? yeah, i mean most girls have it to some degree, but if their legs look like lumps of cottage cheese sqeezed into a pair of stockings then i dont find that attractive and obviously wont date them. A small amount is fine i guess, not particularly attractive but not a deal breaker either.
acne? wont consider you, sorry but its gross and it is not attractive to me at all.
small boobs? one of the subcontious attacters for me is big boobs, so whilst i wont conciously dismiss you, i probably wont feel any attraction.
Of course everyone is flawed to some degree and often we pick and choose so obviously i would overlook stretch marks if they had a great overall body because they dont bother me that much, but a pretty face is important to me so severe acne would be a bigger hurdle to overcome, stuff like that.