While some of the over-tuning in Black Temple is needed due to patch 2.4.3 talents, improved game knowledge, item shop, and time between content releases, some of the tuning is outrageous.
Take Mother Shahraz for example. The fight is basically like playing slots. At any point, your tank could be hit with an 11.5k Saber Lash and 11.5k auto attack within .1 second of each other. Even with every physical mitigation debuff on the boss (Shadow Embrace, improved Demoralizing Shout/Curse of Weakness), and the tank being fully buffed (including ironshield potion + Inspiration/Ancestral Healing), he can still take 100% of his health in less than a millisecond. The tank is forced to wear full avoidance gear if you want to dent Mother.
Illidan is another example of a boss whose auto attacks do entirely too much damage. Illidan's main hand swing on Outland does more than a main hand + off hand swing from retail TBC. This once again forces tanks to wear full avoidance gear, minimizing the threat he can generate.
Enrage timers on certain bosses could be less strict. For example, Teron Gorefiend has ~8.92 million hp, more than twice his retail value of 4.1 million. His enrage timer is 5 minutes, meaning you need around 29,700 raid dps to kill Teron Gorefiend. Brutallus, a Sunwell boss notorious for his tight enrage, in retail required 29,167 raid dps pre-nerf. Post-nerf, it was reduced to 20,420. Teron Gorefiend's enrage timer is even stricter than Brutallus', and deaths are guaranteed on Gorefiend.
As I said earlier, some over-tuning is necessary. I am personally fine with the stricter enrages. But I do know some guilds that struggle with it. The increased boss auto attack damage is making raiding much more frustrating, however. Unavoidable deaths on tanks do not feel good. Having to wear full avoidance gear does not feel good. Tanks can go 20+ seconds without being hit once and then be killed in less than a second. I think boss auto attack damage on some fights should be re-evaluated.