It seems at first glance to be an improvement over C-51, especially around issues of accountability. However, the key anti-privacy portion of that legislation remains intact in C-59. C-51 contained the Security of Canada Information Sharing Act (SCISA), which allowed the sharing of any kind of collected personal information between government departments. Critics call this the “total information awareness” approach. 
From the Toronto Star: [both bills] "permit information sharing across government for an incredibly wide range of purposes, most of which have nothing to do with terrorism...the scope of sharing is exceptionally broad, covering 17 government institutions with government granting itself the right to expand sharing to other departments... effectively neuters the core protections found in the Privacy Act by opening the door to the very kind of information sharing that the law is intended to prevent." The Star article is about C-51 but applies to C-59 as well.