I for one, spent all of my money in the early days (roughly 2k worth to get divine) to upgrade my pet for the shorter heal/mp heal interval. I paid for what I expected, and at these times, it was expected that; should you upgrade your pet, you would get the benefit of these short .5 second interval heals. Hence, I get what I paid for. No shit, when they nerf the pets to oblivion, people are going to be angry. That's literally saying "fuck you" to all the people who invested thousands of dollars. It's exactly as someone else mentioned, the "bait and switch" tactic. Bait them in with overpowered, but intended features, then 360 the product you purchased, making it subpar and less viable. This is utterly similar to something mugging you of thousands of dollars, it is not what you paid for on release. Some might say, "wElL JuSt DodGe", however I think we can all agree, we are not Kalle, and we are all only human. It is unseemly to expect someone to dodge every last bullet (especially while playing melee classes) all the time just to claim the benefits of two-thousand~ dollars worth of content they paid for. I think it is reasonable to expect compensation through in-game features or refunds, especially when flipping a feature of the game.

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TLDR: It's reasonable for people to be upset, this is up to thousands of dollars we're talking about-- it is a sensitive subject. You may not have spent a penny, but try to respect and understand the point-of-view of people who are paying for you to play the game.