Apparently that good sound is due to extensive software processing. The asahi devs really want to make a good impression, so they're spending a lot of time tweaking their sound processing to try to match or beat the MacOS quality before release. Which is both good and annoying. I appreciate the attention to detail, but it would be nice to have any speaker support when I just need to hear something quickly.

The graphics drivers are still in active development, but they have OpenGL3.1 support. Vulkan is under development.

I haven't tried games, but have seen some posts where users have them working. I don't think many games are compiled for arm yet though. The graphics dev did a youtube stream back in march where she plays steam games using FEX-Emu. https://www.youtube.com/watch?v=CJSfFzsU75g