I have been getting incredibly low reputation gains normally provided when completing quests associated with faction NPCs. Quests that are intended to award as much as 350 reputations points are actually giving less than 100 - e.g. Iverron's Antidote, Wanted: "Hogger".
Additionally, when a quest NPC awards reputation and is part of an alliance (e.g. Orgimmar-Horde, Darnassus-Alliance, Everlook-Steamwheedle Cartel), 25-50% additional rep is granted for other factions of that alliance. Currently this element of rep gains isn't in effect at all.
These broken rep rates make it very difficult for players to enjoy much-needed discounts on riding training, class training, reagents, recipes, auction house fees, and other supplies provided by the various factions, as well as making it almost impossible to obtain vendor mounts not native to their race.