And they were right. BWL is harder than MC. Some guilds still haven’t killed neferian. Some guilds took 5 months to get their first kill. Some guilds broke up over the inability to get past firemaw. What you’re demonstrating here is a selection bias and ignoring examples that are contrary to what you want to believe. The fact is BWL is marginally harder than MC. This doesn’t mean it’s extremely harder, or much harder. Just that it’s slightly harder.
IT’s also fair to say AQ40 will be harder than BWL. Many guilds will not kill C’thun. Many guilds will break up because of their inability to progress into the content. Yeah, lots of guilds will kill c’thun, and in general aq40 isn’t a super hard raid by retail standards. But once again it is marginally harder than BWL. Everyone has to know what they’re doing or your raid will fail. For vet mmo players this won’t be a problem. But for the inexperienced and LFR heroes of retail, they will struggle to coordinate their raid in aq40.
Naxx will definitely be the hardest raid in the game. But again that doesn’t mean it’ll be super hard or remotely challenging for competent guilds. Just that it’ll be hard for people who don’t know what they’re doing and didn’t prepare. Most guilds will struggle a little bit in naxx as that’s when tuning starts to catch up with us a little. The pro guilds won’t have a problem. But it won’t be cake walk for average guild.