With UE4 it seems bit more complicated to get working armatures from blender,
Definitely, Unreal seems to be designed with Maya in mind; there are a host of really useful Maya scripts that come with Unreal - to help with character rigging.
There's a bit of messing around you have to do to get FBXs exported from Blender in to Unreal - but the process is definitely improving and there have been a lot of improvements in the latest version of Blender (2.73a).
If you're having any trouble, there was a twitch stream from Unreal dedicated to this topic in mid January :