>>6580
Disclosure: I haven't used Qubes in quite a while.
Qubes is supposed to be a distro made for personal security, but people think its "security" is bullshit, for multiple reasons (QEMU and Xen have had many vulns; VMs really are not the same as isolation, ...). I was surprised to see that programs in the VMs are running as root... so I kinda agree with that. I'd guess you could easily pivot between VMs if you have 0days for QEMU.
You can play games on Qubes. There are some guides out there for that (not sure how outdated they are though). You need a dedicated GPU for that, though, and ideally an AMD GPU, IIRC.
Qubes is really cool if you believe you are safer because of like tinkering with stuff, but it gets tiring after a while. The usability(?) of the UI kinda sucks; it's written in python so crashes happen sometimes, etc. Also, Xen, QEMU, etc. have some limitations (eg: you can't run nested VMs, which would be really nice for researching stuff or, hell, working with emulators and shit). I also was never able to get a Windows VM to work. YMMV.