[esistgut]

It is an interesting educational project but staying away from Unreal or Unity3D is really a tough decision if your project is going to need some more features that are already developed and well tested in one of these engines.

[golergka]

In my experience, the real value of the engines aren't "features", but tools oriented at level designers and artists. Once you have a project with 10 or more members, managing art and assets becomes a real headache - and most of homegrown solutions, as well as open source engines start to fall apart at this point.