I've tried to roll with the changes, but the change to Cheetah is a raw wound. When I'm supposed to run along with and beside NPC's doing the beginning Draenor quests and I cannot keep up with them something is seriously wrong.
To be fair, I ran the same questline with my Shaman the other day and she had NO problem running along side and keeping up with the NPC's.
No shape-shifty-ness speed enhance involved.
I only PVE and I found cheetah to be very beneficial while running through dungeons and helping me keeping up with my hubby who runs like a crazed rabbit with his tail on fire.