Having done the SQL 2012 MCSA prior to these changes I agree the warehouse exam is pretty tough if you don't work in a warehousing environment. But as a DBA I would say its the best exam to take to improve your skills.

It all depends on what kind of DBA you are. I am lucky enough that we have dedicated dev and admin teams that cover the other aspects which you can choose as an alternative exam. So I got the most out of the warehouse exam than I would of the others that I can use day to day.