The only games that are giving me trouble as of now are:
Endless Ocean: Gives an error and and asks me to refer the Wii manual
Endless Ocean 2: Starts loading with the penguin moving at the bottom of the screen. But gives an error "Unable to read the disc". I believe it's more to do with the media as I am currently using Sony DVD-R.
Will try some original PAL games and see the outcome.