Whoops, don't know why I didn't post what game I was trying. It was Star Wars: TFU. It plays fine, though, minus the long load screens.
But if you let it sit at the "Press A+B" screen so that it plays the opening video or whatever, the video lags to hell and freezes my Wii. At least the game plays though.
Also, on that Backup Launcher wiki page that lists the compatibilities, it says the de Blob NTSC one has some issues but it says the PAL one has no issues. Could I get the PAL one and use the Force NTSC option and have it run fine?