And yes, you may be a better raider or have a better raid group than they do, a more skilled collection of people. You also might have a better class comp or have gotten lucky on a few occasions when they didn't. Some groups lost key players at the worst possible time, had real-life issues to contend with, or simply started later than everyone else.
Why do I bring this up? This forum thread on the EU forums, where Draztal ( who is rapidly becoming one of my favorite CMs) is constantly forced to deal with a mindset that does not seem to understand that each raiding group's experience is personal to that group and cannot always be extended to the game or all its players as a whole. Now, not every poster in that thread has that issue; there are some good ones in there, and you should read it. But it's a mindset I see over and over again.
The game is large, and no two raid groups have the same experience playing it. Some raid groups loved tier 11; others were bored or hated the fights. Some raids had fun in Firelands; others found it repetitive or disliked the zone's tendency to be all one color. (I still say Bastion of Twilight had exactly the same problem, but that was alleviated by its being one of three raids at launch.) Some folks have enjoyed Dragon Soul; others dislike the mechanics or the use of Wyrmrest art assets.
Having these differences of opinion is a fine thing and can be good for the game and its community -- when you acknowledge that they exist, and when you realize that your own strongly held opinion about the raid finder, heroic modes in raiding, or the superiority of this fight or that fight is rooted in personal experience to some extent and that experience will never be shared with everyone. That goes for things you love and things you hate equally.