Yes, he's for real. he's been one of the top "prospects" (using the term loosely) in the majors for some time now, and has almost limitless potential.
Unfortunately, playing time is still an issue for Durazo. The D-Backs tend to favor veterans, and Durazo sat this weekend against a lefty - never a good sign for fantasy owners.
A .300+, 30-homer season certainly isn't out of the question, but there may well be lots of did-not-plays on the way.