No issues here...
PAL Wii - 3.2E, Wiikey 1.9G...
I burned MK-Wii without ANY patching (at 12x on a Verbatim DVD+R media (16X certified media)), applied the patch from the disc, played the flower 50CC Cup, installed the MK-Wii Channel... played some more (two-player, single, time-trial)...