can someone please tell me of the game engine (3d) that uses c#, opengl, easiest, lots of tutorials, and has the largest userbase game engine? i looked around, not sure which ones the best
Which engines have you tried? Any of these? And by 'tried', I mean actually downloaded it, looked at it and gotten a feel for it...
Well, unlike me, some people like the easier stuff. DirectX maybe a too advanced for him & so maybe XNA.
That's a matter of opinion, I personally feel the other way around. OpenGL also exposes a lot more functionality than Direct3D, and when hardware vendors add new features to their GPUs, they can make it available to the end-user much faster by simply adding a new extension to their driver. With Direct3D, you have to wait until Microsoft releases the next version.
I find MDX the best when using C#.
MDX has been deprecated since October 5th, 2006, ie. no more functionality will be added. Ever.
OpenGL is proven to slow down the games it's made in.
Proven? This sounds like BS. Could you provide solid proof of this, please? Doom3/4, Quake4, Rage all seem to run just fine...
...since C# isn't as fast as C++, OpenGL with C#, you'll have one slow ass game.
The next version of C# will be able to compile to native code, so it should be just as fast as C++.