Halep played 5 WTA finals this year and won all the finals played (and Halep never won a WTA title in the past).
She won twice on clay, once on the green, once on hardcourt, once even indoor, so in all the official surface of the WTA
She has a great FH, a great BH, from the baseline is wonderful, a quite good serve and she is a perfectionist. And there are still people that dislike her cause she hasnt boobs anymore
and all this with a not great figure like azarenka, li, serena and others can claim
and all this good stuff are completed by the fact that her game is pleasant to watch and not boring like a lot of other top players. Always attacking the opponent, with a lot of good defenses and speed.