I'm not entirely surprised with this change, although I'm a little disappointed:
Taunts from players and pets are now on a shared diminishing return, meaning the strategy of using 3 hunters to ping-pong tank Razuvious using Distracting Shot won't be possible.
I realize the change was more for other bosses, where tanks could decrease damage taken by running the mobs around with taunts, but the Raz encounter really *does* require some actual coordination and concentration between the hunters to achieve it. Not to mention - all those guilds who use this strat because of a lack of priests will be totally out of options when the patch comes around.
Oh well - I suppose those guilds coordinated enough to do the Raz fight with 3 hunters will probably not need to do Naxx once Ulduar comes in anyway. I'd have liked to have a go at it myself, but my guild's priests are fairly reliable and we don't want to waste too much time on farmed content (we still haven't tried Sarth 2D or 3D yet), so it's not likely I'll get a chance before it gets nerfed.