Really few more visible Dunning-Kruger basket cases than those found in games that contain elements of (computable) chance.
Most bad players will persistently make basic errors of calculation, then complain even at outcomes favourable to them, perceiving them as unfair.
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(Graceful, fun-having bad players do exist, but are comparatively rare, since it's a bit unusual to be both very bad and aware you're very bad.)
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It's really pretty striking that you can have people accumulate demonstrably bad records over hundreds of games (<40% win rates, huge money losses, or whatever applies), and still believe that it's luck that fails them, and benefits their opponents.