Reasons not to root for Sharapova:
- she's a one dimensional player: hitting hard the ball and nothing more.
- her shots are clunky and not so great to see
- she screams a lot
- she's taking 40 seconds every time to serve (what your're looking at ?)
- not a great character outside the court: she's cocky, a bit arrogant, not funny (if any woman is funny), nothing interesting that she says.
Reasons to root for Sharapova:
- she's a beautiful and hot lady
Reasons to root for Halep:
- great ball striking both on forehand and backhand; great movement on court and good serve for her height.
- stylish strokes and great to see.
- great aggressive counter puncher; knows to play in many ways, knows to vary the game; takes the ball early, goes to the angles, changes often the ball direction and goes for the winners whenever he has the opportunity.
- she used to have once some great boobs.
- cute girl (not necessarly beautiful)
Reason not root for Halep:
- not a great net game
- not a great character outside the court in the sense that she hasn't got anything interesting to say but she's a nice girl.
- she used to have once some great boobs
Do the math
Math is never wrong. It's mathematically incorrect to root for Sharapova 
That's just shamelessness from the russian. Also, she took 10 minutes to go to the toilet.