I use it as my default browser. The Cloudflare and CAPTCHA spams doesn’t happen to me that much (that would be Tor). For whatsapp, discord, emails, I would normally use Firefox, until I switched to Zen.
MB has been indispensable and my only regret is not using it when it initially came out. You’re switching to two-browser mode when using MB that is Brave/Firefox/other browser for account logins and MB for non-account logins. It’s a bit of an adjustment ar first but really boosts your privacy.
Mullvad support replied about the broken websites I have encountered. I provided them three. The main thing they found was that they did not like DoH and recommended changing that option for accessing those sites.
Mullvad’s reply:
USPS (Note: USPS is US Mail website) seem to actively block our DNS from resolving their domain.
I can only recommend using a different DOH server in the browser to
reach it, that might also help for the other pages.