Is it normal to hate hatsune miku/be sick of the sight of her?
No offence intended if you like her, BTW. In fact, feel free to back up your defense.
I went to MCM in London last weekend and saw at least 5, if not 6, people dressed as Hatsune Miku to varying degrees. Her face was on lots of merchandise and I just found it really annoying that she is everywhere.
I've listened to a few of her songs. I certainly wouldn't call myself a fan and wouldn't really choose to listen to her stuff, but I wouldn't actively avoid it.
What gets me most is her personality - she seems really precious and weak in the most annoying way.