Superku, MED is a terrible piece of programming and the weakest part of GameStudio. This is not just a matter of one person's opinion. MED is based on ancient technology and has hardly changed since the days of it's predecessor, a Quake modeling tool (certainly you remember Quake and when that was originally released, right?).

And, yes, GameStudio is a development suite but, as you pointed out, it is missing a paint program. It is also missing tools to create sounds and music. It is missing tools to create video. So, really, apart from coding, it is missing any tool you would need in the creation of a game except for creating 3D geometry. And both provided tools (both MED and WED) are outdated tools that make it difficult to create anything more than the basics.

Other engines are missing various things, but also have various other tools that GameStudio may be lacking.