Can you make some examples of missing features ?
Are you speaking of graphics features, maybe ?
As far as the game play is concerned it seem ok, GC supplies more than 700 commands

No tutorials ok, but documentation does not look so bad, considering , as you said , that it is a relatively new engine

About the bugs

I am little surprised of what you said

Many end users complained that you can not even finish a simple casual game in B.V

I remember for example that the fps was progressevly slowing down in a period of time
Entities passing through the walls
Problem to import even the most popular file formats
Crashings any minute of two

Many people left B.V. normally this happen because of serious bugs

As I said however I never used B.V., just repeating what I read
Actually I tried the demo and it crashed very often

If you are right, it would be a shame because the engine sounds really good