I'm not sure I can parse this correctly. When you say "it was ...", are you referring to OpenGL or D3D? (Myself, I first touched DX with version 9. I was an OpenGL-only guy before that, but DX9, for all its drawbacks, was much more stable at the time. DX9 offered FBOs and the FBOs worked. OpenGL offered FBOs, but the Moon, Sun, Jupiter and Carmack had to align before they'd work. ATi's OpenGL drivers didn't help, either - they are much better now.)
And it's not wholly what you're saying. Microsoft didn't make it easy to choose OpenGL at the time they came out with DX8 and beyond. At that point, it was, while painful to use, much more credible due to feature set and the "easy" choice on Windows.