Whether any particular tutorial is good or not, it's almost automatic that people (especially in the Haskell community) question whether we needed /yet another/, because there are already so many and most of them are not that great.

IMO there's nothing wrong with more, but the fact that there are so many out there seems to perpetuate the incorrect belief that it's something you need to learn to actually use Haskell. I suspect that the GP was addressing this belief, not saying "nobody should bother learning this stuff".

In general the Haskell community seems way too obsessed about monads. I just checked the "official" tutorials [0]. I was happy to see they all introduce IO without talking about monads. However, the linked wiki page has a whole section about monads. In contrast, there nothing about concurrency or transactional memory, despite that fact that this is one of the strong parts of Haskell.

http://www.haskell.org/haskellwiki/Tutorials