Yes, they are excellent, specially because they really guide you through the game, instead of describing screen after screen without a connection between them.
He could put the screen codes, though, at least in the beginning of each path, or secret area.
Those are the walkthroughs I usually tell people to take a look when they ask for help in the Oddworld Help Forum.
Here is the URL to Sinjin's Site (thanks, Chris Co Depot!)
Sinji's Walkthrough Site
Over there you can find a ton of guides to many other games.
Just another thing: Sinji's site promisses a Munch's Oddysee walkthrough ASAP. Let's stay tuned...
[ September 27, 2001: Message edited by: Lampion ]