I like how each boss battle is given a 1-2 sentence explanation. The one that really irked me was #7 (C'Thun). You could write an entire article on why that was one of the most memorable boss fights in MMO--and maybe even Gaming--history. But alas, we get 2 sentences about his demoralizing whisper, with no explanation of how or why he had a leg-up on a number of bosses in that game.
For those that are unaware, C'Thun is historically one of the hardest boss fights (if completed at it's original level) to ever grace WoW. The mechanics were relentless, and left no room for error. What's worse, it was back during 40 man raids, so downing that boss required 40 people, who made no mistakes on the execution. But here's the real kicker, at release, C'Thun was mathematically impossible to kill. People spent weeks trying, and the guys over at (I believe) ElitistJerks took a look at the numbers behind the fight, and discovered you simply could not do it. I think the first couple guilds that even downed that boss had to use a number of exploits to avoid fight mechanics.