Are you disputing the fact they made this change? I can assure you just about every quest I've done on a brand new group of toons (started after patch) leveled 1-25 (With some dungeons) where a quest item needed to be looted from a mob, everyone in the party was able to do so. There have only been 1 or 2 quests so far where this wasn't the case. Collection quests still suck terribly if it's an item you must pick up off the ground / collect items.
This is an example of a "loot item off a mob" collection quest that did
NOT drop 1 item for each group member:
http://www.wowhead.com/quest=26995 Possibly a bug. Who knows. This was only 1 of the maybe 2 or 3 that I can remember so far that didn't drop for everyone.