@ Thyclane: I agree that there's a lot to deal with on Horridon but again I have to ask, if you can't handle the mechanics on Horridon (mechanics not all happening at the same time), what makes you think other bosses will be much easier to handle? Mageara pre nerf would most likely have been a wall for many guilds as well, I imagine Council have cause many people issues too.
The people claiming that T15 is worse than ICC due to gating (I'll refrain from saying you people), forget that the second boss was brutal to pugs as well. Tanks having to pick up adds fast, MC'd people had to be cc'd before they went rampage and there was so many things going on from the very beginning. If you didn't manage to kill all adds every time, each wave became harder and harder and in the end wiped the whole raid.
So, would be it possible to think, that some of the people who are now experiencing Horrdion as a wall, arguing that ICC was better in terms of gating, that they were actually raiding 10 man back in Wrath and not 25? Cause if that's the case, I can surely understand why ToT seems harder.
In the end it all comes down to 1 thing: Are your raiders skilled enough to kill Horridon with whatever gear they have or not? If 502 is the intended ilvl and you walk in there with ilvl 496 as an average Normal mode guild, are you really surprised about the difficulty of this boss? And if you are, is that really fair?