i understand you're very confident,
however, it would be more important for you to offer more information/detail in order to get possible and valid answers.
6 different discs --- dvd-r, dvd+r ? brands?
with different programs --- which one, what burn speed ?
what game/ISOs failed ?
wii is modded correctly -- how ?
basic rule: not all Wii are created equal.
some Wii just read disc better than yours; some even handicapped in reading , especially for a new Wii of 2010