I have been downloading games from both public trackers and blackcat. I burned them at 2x using ImgBurn and 3 out of 4 Verbatim discs games were unable to read. What's going on?

The 4th one was a PAL game, Top Spin 3, which required an update (HELL NO!). Basically it was able to read it but I didn't update. I thought Wii key allowed me to play other country games?