Not a kind draw for Rafa to put it lightly. While I'm not a fan of calling players with soft draws and it ain't their fault, Djokovic is a virtual lock for the final. I can't imagine that Wawrinka will pose much more of a challenge this year than last - the big element of their match at the AO last year was the surprise that Wawa could play that well.
On the other hand anyone can make a hash out of an easy draw and the top seeds might not even meet in the rounds they're supposed to. Delpo might bomb out in the early rounds like last year. Murray is a question mark for me - he wasn't in Doha for long so there's no way of telling quite how fit he is and whether his back will give way.