Rip-off is a bit tough after the improved drop rate in my eyes, but I can definitely understand the anger of people who didn't get her although I feel VIP players are usually more angry than non-VIP players, to be honest.
The problem is the mentality that spending these amount of diamonds is a normal thing to do... 4000 diamonds cost 50 bucks, this is a LOT. If you think about it, you can play AAA MMORPG games without spending this amount. And AAA MMORPGs cost dozens of millions of dollars to develop...
The prices overall are not OK imo. And watching the video that Hengli posted I don't feel like they are doing us any favor. I'm looking at it and thinking the price is ridiculous. Even though it was even worse before. I need to the diamonds for more important stuff like buying stamina refills, and I will not buy more diamonds to summon new heroes at 3*.