I'm afraid you can't really argue against statistics with personal anecdotes; I'm not saying anecdotes aren't compelling, because they can be. I'm simply saying that a tiny, tiny percentage of players raid at the Mythic level - a level you, yourself, have never played at and are, therefore, completely unable to judge.
You can only really judge the top level under this type of context. Mythic raids and high-rated arena is where players are judged and, if you're not competing there, you simply can't claim that the game is easy because you've no way of justifying such a claim.
The number of Mythic clears and Gladiators makes it clear that only a tiny percentage are at the top; and they don't claim the game is easy.
I get what you're saying, and it's relatively fair.
I'm not sure where in the world you hail from, but in Scotland we have two contrasting sports; football and rugby. Football requires a dramatically higher amount of individual ability (technically speaking), while rugby requires a dramatically higher amount of tactical ability. One sport is largely defined by its individuals, the other is largely defined by its teams.
Successfully completing a "scripted event" might not take an individual to do something amazing - that's understood. But the coordination required, with 19 other individual moving parts and multiple other things going on, really does. It takes planning, communication, fast reflexes and awareness from everyone in order to complete the encounter successfully.
And don't forget: much of top level play requires very fast twitch reflexes, particularly in PvP, and twitch reflexes start to degrade by the time people have completed their teens. Given that the average age of a Warcraft player is upwards of the mid-twenties the last I checked, the overwhelming majority of players are already "past their best" and on the downward trajectory. If you're at the age of 15 to 18 then the game will feel easier, but most players aren't at that age.
Just some food for thought.