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What I'm trying to get at is if this graphics engine (is fast and can handle alot of stuff and) can have contents easily added/intergrated into it.
It's not "easy" to do any programming. If it was, it probably wouldn't be worth doing it for a job, you'd get 5 bucks an hour.
But more to the point, Horde3D has an extension mechanism. So extensions can be compiled into the engine. That is how the sound extension is made, same with the Terrain extension. So if that is what you mean by "content" then the answer is yes, you CAN integrate content.
I don't know about OGRE but I have heard that it is difficult to use and bloated, but I used Irrlicht for a year and in my opinion Irrlicht is a lost cause. It is not really advancing. They are concerned with supporting old drivers from the 90's, and the community is very active but most of the posts are crap talk and arguments, they have a lot of smart asses on the forums, and most of the guys running the show never want to fix or enhance anything. Actually, I'd even go as far as to say that 90% of the users of Irrlicht are graphic designers. Even though it is a fairly simple API to get used to, it is still sort of messy and convoluted as if it is being hacked at rather than planned. But it does have many tutorials and user contributions. It doesn't have a clear direction, that's my opinion.
Horde3D has few samples to demonstrate the basic usage of it, but most of the capabilities are still undocumented or should I say, un-sampled. So you will need to spend time working out details or specific functionality. The API is small so that helps, but the API does not obviously demonstrate what options are available and how to use them, such as if you want to set vertex colors on a geometry. Also, Horde3D is in Beta stage (beta5), so the API will change over time, not necessarily maintaining backward compatibility.
Personally, I'm sticking with Horde3D and growing with it because I get the feeling that it is going somewhere good!