I have had some limited exposure to OGRE. My opinion is the tutorials that come with it are terrible and rely on about 20 specific classes. It is unclear from the tutorials if those classes are needed everytime or if the user can use OGRE without them. All in all I was not impressed and I found it harder to use and understand than just using raw Direct3D or OGL.
They have tutorials? Oh they do... I just had a sudden interest in it because TheNewBoston said he was going to do some tutorials about it and I thought hey might as well give him a shoot, he got me on my feet for programming.
I develop a small game (Opensource Game Studio) with OGRE and like it more than any other engine. It's the only Open source engine that uses exceptions known to me.
Also, the tutorials are very good. Especially when you reach one describing internals.
And stripped lib is only 5M unlike many think.
I've found it middle of the road. It isn't great. It isn't bad.
That said, the appeal of video tutorials for something that is text by definition confuses me.
I guess I am just an auditory and visual learner.