First approach :
Its like UT2 with shaders on top.
Interface has not changed a lot from UT2 : it is not very intuitive like the icons.
Terrain is same old system, it's not an engine terrain oriented like Crysis engine.

Lot of panels, hard to understand or play with it without documentation; lot less intuitive than Unity 3D.

Well i'll try some simple tutorials if i find ones on the net to see if it's possible to really pull out something cool from it without too much effort and trys ?