There are no limitations to the X, Y, or Z rotation values. The Orientation property is an array of 3 values. Each value is limited to a range of 0 to 359.9. Orientation is the default property that is controlled when you use the Rotation Tool (w) and do not grab a specific axis. There is an option in the Tool Bar to choose Orientation or Rotation.
If you have chosen Orientation and you grab the Y-axis using the new 3D widget in the latest versions of After Effects, and you drag just on Y, you will see some confusing values in the Orientation array. X and Z will flip back and forth between 0 and 180 and Y will scrub between 0 and 359.9 as you observe the values in the timeline. Orientation is used to orient a layer, then Rotation is used to spin a layer on a specific axis. You just have to use the right tool (w + select the proper option in the toolbar) or simply scrub the values in the timeline. The behavior is similar in all 3D apps that have orientation and rotation properties for layers (objects).
I should also mention that if you want to rotate a layer more than 360º you will need to enter the value in the timeline or drag the appropriate property value. The rotation tool "w" is limited to one rotation so if you are setting keyframes and want your layer to make 4 complete revolutions in 10 seconds you'll have to create the second keyframe in the timeline.