I also had instant craches on OpenGL recently with mys HD 4600, but they stopped occurring earlier this year. Maybe in January-February 2014, and I had updated my Intel drivers about the same time, so my guess is that the crashes had to do with those old drivers.
That being said, I still prefer D3D with HD 4600, since it seems a bit faster, Vsync works better etc. The glitchy pixels bother me, too. Enough to install Visual Studio, revert to old TEV combiner formula and build my own version. But it gets better, magumagu has already introduced an even cooler solution, which should be pixelwise the same as the present dev build, just without the glitches. And it is very easy to implement in any new build. Check thread https://forums.dolphin-emu.org/Thread-graphic-glitches-on-d3d-backend-on-intel-hd-4600-since-dolphin-version-4-0-1288
and issue tracker https://code.google.com/p/dolphin-emu/issues/detail?id=7167&q=intel for more detail. This may be patched in future dev master builds.
That being said, I still prefer D3D with HD 4600, since it seems a bit faster, Vsync works better etc. The glitchy pixels bother me, too. Enough to install Visual Studio, revert to old TEV combiner formula and build my own version. But it gets better, magumagu has already introduced an even cooler solution, which should be pixelwise the same as the present dev build, just without the glitches. And it is very easy to implement in any new build. Check thread https://forums.dolphin-emu.org/Thread-graphic-glitches-on-d3d-backend-on-intel-hd-4600-since-dolphin-version-4-0-1288
and issue tracker https://code.google.com/p/dolphin-emu/issues/detail?id=7167&q=intel for more detail. This may be patched in future dev master builds.