RS barely changed at all; all the added was an ability system...Took me less than a day to figure out how to utilize the abilities to my advantage. I'm just working out the intricacies now; I'm already killing at roughly the same speed as before. If not even faster. The only difference now is that it's not easy to flash SS with the abilities. Game is more engaging then just click and watch like before.
IMO, the people who bitch about this has not tried combat and is just bitching for the sake of bitching.