[Update]: World of Warcraft will soon be reverting the rather controversial Global Cooldown changes.

World of Warcraft's abilities can be broadly categorized into two groups: those that require you to briefly pause after using the ability, and those that can be chained with other abilities without any restrictions. Your standard spells like Fireball or Frostbolt belong in the first category, while the second category is almost exclusive reserved for power-up spells, escape abilities, and powerful defensive cooldowns. 

While it might sound complicated on paper, it's a fairly simple and effective system. As such, I must admit I'm a bit surprised to announce that Blizzard is aiming to remove the second category and make it so the vast majority of abilities incur a global cooldown after use. If these changes go through you can expect to see the combat become slightly but noticeably slower, especially for classes that rely on combinations of abilities for their damage or defense.

Personally, I am not a big fan of these changes. A lot of WoW's classes are already too slow for my liking, so to see the combat become even more cumbersome through boring global cooldowns is a bit worrying. After all, half of the reason I purchased Legion is because the newly introduced Demon Hunter class offered an incredibly fluid and fast paced gameplay style. It was and still is a highly enjoyable class to play, so I'm not exactly sure why Blizzard is trying to mess with a winning formula.

It is important to mention, however, that these changes are currently on the alpha Battle for Azeroth servers and as such are subject to change. So whatever your opinions may be, I would highly recommend going to the official forums and letting Blizzard know. This change is simply far too important to happen in silence, so do make sure to get your voice heard!