The android app is horrible. They used to have 10-30 minutes of cache time, now they have 0. You go under a tunnel, on the tube, whatever, and your stream cuts out. Also lots of UI bugs. This might have gotten better but I wouldn't know as I am on an older version of the app and refuse to upgrade due to no more caching.
You have to pay to rewind stuff apparently (I do pay so have never been impacted here)
Search is horrible, even now.
Web has some major bugs like randomly reloading half the page when you scroll down your feed and click listen to something. Old app has some ridiculous UI bugs, can't comment on the newer ones though.
Mixcloud select may have been done with the best intentions, but it's just a bunk idea. Half of my feed is now "select" stuff I can't listen to. The idea is you pay the individual artist and get premium features. But the select costs a fair bit of money, a lot more than id be willing to pay. Effectively, even as a paying user I'm now being paywalled. They should have kept the stuff free and heavily integrated with patreon or done a tipping style platform.
Sorry for the long rant but I figure this is a chance to actually have someone from team mixcloud potentially read some actual feedback that they're probably sheltered from normally.