I'm hoping it will work quite well for us as the biggest consumers for this information is the accounts department and you know how accountants love excel...
As they are quite sceptical about reports on data that they haven't written themselves, they tend to be rigorous in their scrutiny of the report cross checking against their own systems. You can't really complain with that level of testing and as the poster above says it will be easy to make a bad data warehouse hopefully this will lower the risk somewhat.
Plus it stops them using enormouse spreadsheets with vlookups all over them that take forever to run and use up vast amounts of disk space...