Hairstyles? That depends. If it's so outrageous that it looks good, why not? I don't think I recall any hairstyles that I hate though...
That being said, hairstyles is rather important to establish character personality i.e. Twintail braids usually indicates nobles, short hair or ponytail sometimes indicates tomboy personality, etc.
Personally the best hairstyle is obviously that of Ika Musume.... for.... various.... reasons....