I was sure we would be mentioning Blender UI :) Well indeed, not very noob-friendly and not very respectful of UI conventions. However, it is reckoned that on

I was sure we would be mentioning Blender UI :) Well indeed, not very noob-friendly and not very respectful of UI conventions. However, it is reckoned that once you get use to it, it is very efficient : No modal screen. The screen is divided. You can adjust your workspace depending on your current task. Tweaking parameters is very easy thanks to well designed widgets. If you try, remember that you should leave your left hand on the keyboard (like a fps) and use the keyboards shortcuts.