I noticed that it really depends on the dump. I tried 3 different dumps: an early dump, Wiitard proper, and another later release. Two of them would freeze at the exact same point in the cutscene where Samus is walking through a Galactic Federation building (academy? base?), right before it switches to outside the building. (This cutscene is the one right after you defeat the first, easy boss.) The other release wouldn't even run.
I noticed that the sound for the Disc Channel does not play in
Wiiflow for the broken releases. Good way to tell, I guess.
I found two releases, however, that work. Reidy release (TLS games), available via torrent. (this is the one I normally use, since it was the first I had that worked.)
The second release was by TheWiiKing at [the]paradox.

He actually explained why a good dump of Metroid: Other M does not work properly.
My guess is that the first 2 dumps I had that would work until that cutscene would have been fine if I had removed the Update partition and scrubbed the ISO, then ran the game under cIOS Rev20b with IOS56 base wad. I'm not sure yet, even if that is all that it takes.
One things for sure, make sure you have a working dump.
Edited by Troop116rules, 09 September 2010 - 06:11 AM.