Blender's default ui is pretty horrible, if you are used to 2D design... At least it's customizable, but the documentation on what everything does is pretty much nonexistent. It took me the better part of 2 hours to get the ui customized to where I could do basic things, like scroll around the object, and move the object with my touchpad. I tried it out in 1996, and again in 2004 and again in 2013... It's come a long way, but most of the functions seem to be for animating. It would be nice if it had a 3D printing mode where all those extraneous things (camera angles, frames, light sources, etc) went away.