Yes the art is important, as are the props. But unfortunately both are expensive.
I guess the ideal introductory rolegame should have: nice painted miniatures, nice full colour character sheets, full colour gaming tiles, and possibly a set of (again) full colour cards for spells, weapons, creatures, etc. The players should be able to play by having a look at their character sheet and their cards only -- no boring manual. Only the GM should need a manual, which should be as short as possible (like the original 1981 BRPS booklet).
All IMHO.