[RANT]

From personal experience:

1. People in the West have no drive.

My first static (which started on SCoB) started as 8 people who, as a complete team, showed up for...1 raid. Seriously, we had 1 raid as a full static before people a.) stopped showing up on time b.) stopped showing up at all c.) gave feeble excuses for why they couldn't attend...the list goes on. Sure, real life does sometimes clash with raid times and you won't be able to make it, but do you really need to see granny every Wednesday, the one day everyone else can make, when you could see her on Thursday instead? Do you really need to get drunk every Friday night and have nothing to show for it but a splitting headache on Saturday morning? Chances are you don't, but people will slack off and play the Real Life card when it suits them. They will turn up when they feel like it and, when the team goes nowhere, they'll just leave and hope to latch onto someone else who'll carry them through the content.

2. The constant reinforcement of the idea that "Nobody gets left behind".

We're brought up with the mindset that we're all special snowflakes and we can do anything! What was that? I can't do something?

"THERE'S SOMETHING WRONG WITH IT!"
"MAKE IT SO I CAN DO IT! I SHOULD BE SPECIAL TOO!"
"I'M GOING TO QUIT!"

If we have to put effort into something, like improving ourselves, it's too much for us. We can't do it. The world should change to accommodate us, we shouldn't have to change. Guess what? When everyone is a special snowflake, everyone is the same. I believe there are very few people who are bad in such an irredeemable way that there's no hope, but you can't get better at something if you refuse to put in the effort and if you don't want to put in the effort? That's fine. That's a valid choice. Just don't complain if you don't make any progress.

[/RANT]

Sure there are exceptions to the above, otherwise all of the NA/EU servers would be on <1%, but it goes a long way to explaining why we trail the JP servers by such a large margin.

tl;dr - People in the West don't care enough to beat the content but do care enough to moan about not being able to beat the content.