{Rotation:} doesn't actually affect the rotation that a /summon 'ed mob spawns in.
All 4 of these commands will summon a Creeper facing South no matter what even though 3 of them should spawn facing a different direction:
/summon Creeper ~ ~ ~ {Rotation:[90f,90f]}
/summon Creeper ~ ~ ~ {Rotation:[-180,0]}
/summon Creeper ~ ~ ~ {Rotation:[180.0,0.0]}
/summon Creeper
Related issues
is duplicated by
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This is also happining with /entitydata ... you cant change the body rotation (but the head rotation you can) .. can anyone confirm this?
(I spawed sheeps with NoAI and rotated them after that but nothing happened)

Confirmed for 14w32a-14w32d

Confirmed for 14w34d
It would be nice to see this fixed so mapmakers can spawn a mob rotated a certain way without having to spawn them, then tp them to their exact same coordinates but with rotations applied.

Mobs don't serialize their orientation

And why then you don't change this?I mean what kind of attitude is this?You could also create a category for "Minor bugs" like this, but instead you just say the don't and close it as won't fix... great really great
Sorry

Thanks for fixing!
EDIT: The Ender Dragon (NoAI) still is completely unaffected by the Rotation tag, but that may be a different issue. (Tested with second command)

For the other three commands, you need to put f after each rotation value, otherwise it won't work.

Never mind

@unknown the bug with the EnderDragon is MC-74279 and marked as *Won't fix*
😞
Confirmed (at least the rotation around y axis doesn't work, the head rotation around x/z axis does work)