Compared to nVidia and AMD, Intel used to be much better. These days the driver situation isn't as rosy. There's a spotily maintained X driver (no releases in 3 years, updated by git snapshots) that is even being replaced by the generic modesetting driver in some distributions to avoid bugs. If you want flicker-free GUIs, tear-free video and general lack of bugs it's a bit of a crap shoot right now. The kernel driver does seem to get steady progress though, which is why the generic modesetting X driver seems to be a way forward.

Meanwhile both the AMD and nVidia situations have improved with more robust open source drivers appearing. I don't have experience with those to know if they've surpassed the Intel drivers in general quality though.