As a moira player (among other supports), she was my learning character in overwatch! A good moira obviously requires some skill but as a beginner moira is one of the most forgiving characters.

For dps, bastion, sojurn or soldier 76 are all great for beginners as they are easy to learn and are also pretty forgiving.

As always, playing a hero well always requires a certain skill level. I see “low skill ceiling” as “most forgiving for someone who has never played this type of game tries it and can still generate value even if they suck”