I was really excited for the 4x speed, but now that we have it, I have mixed feelings about it, and even a bit more, up to the point I started to think if I should stop playing the game.
The problem to me is that playing at 4x speed will soon become mandatory (it is already if you want to receive rank rewards in PvP) and the game at this speed is less enjoyable than before. The guilds will soon increase their reqs and the 4x speed will become the standard speed. Everyone playing at a lower speed will have a disadvantage. There are only rare cases where people will use slower speeds, mainly for complex GW battles.
In the end, that'll just increase the number of battles we'll do, everything will scale with that speed over the time. I don't see this feature becoming a time saver. And considering the number of battles we'll have to play, the game will become a farming fest more than ever and more than anything else.
Now that I have tested this new speed for a few hours, I would have loved to see increased rewards and improved mechanics instead of this. In other words, I would have loved to see the game funnier than faster.
Considering the fact that I was the first to get duped by the effects of the speed, I don't think there's no one to blame. You have to actually see this in action to understand that it's not gonna help the game that much. I hope that this idea could be rethought in the future because I don't think this feature will add something positive to the game over the time. In two weeks, the only change will be more rewards for less fun (repetitivity is a game killer) and this could have been achieved in better ways, like by simply increasing the rewards.