Ofcourse girls dont like to be obvious. Same thing applies the other way: my interest in guys quickly wanes if they are making their moves too obvious. It smells of desperation; I much prefer the uncertainty and excitement of not knowing, just hoping that my gut instinct is correct.
Also, you have to remember that different girls flirt in different ways in different situations. You just gotta feel the vibes and what they are telling you. It gets really hard when some girls actually ignore guys when they like them (I do that sometimes, almost unknowingly.) Oh, also, and interesting and kinda irrelevant point is that I know I like a guy a lot when I cant for the life of me picture his face in my mind. Strange, I know.