Well in the end it's just the editors that recently have become Windows compatible - you could deploy Direct X games for quite some time (maybe even since Unity existed - dunno when this actually made it into the engine)...
Yes, this is almost true. Most of the 2.5 work went into the editor. But there are some other features and bug fixes as well. But did you see what they are working on currently? This is impressive internal stuff to optimize the engine: http://blogs.unity3d.com/2009/04/10/unity-roadmap/#more-411
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The problem : C4 need lot more programming, and even C++.
This is really true in the beginning. Since C4 is a very general engine you have to write some structures, classes and controllers for your nodes in the beginning. But then everything is OOP and modular so from a certain point you will have less code for game logic, no spaghetti and better to maintain source.
But I understand that it looks overwhelming in the beginning.
