As per community request and as per our own review of difficulty of 10-Man encounters we have made a few changes with several encounters in Naxxrammas 10-Man encounters. We did not tone it down significantly however we believe that the changes done will make some bosses less of a pain and more of a relevant challenge for groups doing them. We still want to note and clarify that our directive is to make the bosses challenging without changing mechanics and without going away from the 'blizzlike' concept we strive to be.
Below you can find the list of affected encounters and NPCs with relative percentage of changes to base values:
Are you planning to nerf a bit more after Ulduar's release? Like reducing the HP and the melee damage of some bosses/adds for 10-20%. My guild started Naxx 10man this weekend, and we struggled to kill adds fast and also with the tank healing on Grobbulus and Anub'Rekhan.