1) Things are very glitchy, even for desktop applications ... If you don't believe it, run Wine from the console, and look at the amount of stubbed stuff which gets run.
2) Glad you care more about people willing to run proprietary code to get their games working than real OSS solutions. For games, I chose Windows (it's only twice as fast, without the glitches).
3) Neato

Well, I don't care, downstream makes that choice for you, and includes WinePulse (defaulting to pulse). And unlike your oh-so-great ALSA backend, it actually works. It will likely be the same for the 3D backend. Generally about Wine, how about dropping the stuff that is obviously not working from the configurable options that have a GUI ? For example, right now, among your official sound plugins, only ALSA should actually be mentioned.