well, clearly kyrie and lillard are just celtic homers.
seriously, though, i think bradley has done a good if not great job, and as the team plays better defense around him, it's been easier for him to make an impact individually on the defensive end. with extra talent around him he can gamble a bit more and make big plays, knowing his teammates have his back.
hopefully we get an elite defensive center soon, with better talent on the back end i can see smart, bradley, and crowder having a field day getting steals and breakaway dunks.
edit: to answer the OP's question, i don't know that he's all-nba this year... IMO his teammate smart has been a bit better... but clearly bradley should at least be considered, and maybe not getting the votes will push him to work even harder.