[Yin]

My opinions...

Ogre3D: The material scripting sucks, I very much got the feeling it was made by programmers for programmers - people who think a single diffuse texture or a chrome effect is nice ;P
I had lots of problems trying to make some things work. I asked on the forums, and I searched the forums(some questions I had was already asked, but they were never solved...), and I searched the net, read the wiki and read the not-so-good documentation... And I still never got specular maps or normal+alpha to work good. Also the normal maps looked like crap.
We had schoolprojects using it, most of the artists was very frustrated... At least the ones in charge of learning the material system. In the end, my project used only diffuse maps.
Ogre seemed great for programmers, but I think they forgot the artists.

GLScene: A set of components for Delphi(or the free clone Lazarus, though it's not 100% working there). I have to say, they're great. It's so easy to use, even I can program for it with my random pascal skills. And the result is great. Only problem I had was recently, couldn't mix normal(normal maps that actually look good) and alpha. But someone on the newsgroup quickly suggested a solution... But by then I had already remade it with geometry, but good to know that it's not impossible.

That's my experiences with free 3d engines ^_^