First thing about Westphal- he is NOT Paul West-HEAD, he of the "balls to the wall" offensive schemes and other no-D mentality. What he is (and let me start with the negative first) is a coach that had a falling out with the last marquee player he coached (Payton) and seemed at a loss for answer with teams that had nailed the fundamentals and were thus able to exploit his ambitious (and somewhat dysfunctional) defensive schemes (CHI in Finals, '94 Rockets, Jazz). He also inherited solid, complete pieces with both PHO and SEA and largely tanked in the one instance he had to execute any real player development (Pepperdine).
That said, he has experience at the collegiate (Pepperdine) and NBA (PHO and SEA) levels, and has also served as an assistant coach and executive in this league- adding to an eye for scouting and instinct on what is required in specific situations maybe outside the vision of a head coach. He runs an "up-tempo" offense that blossoms under the guise of a pass-first point guard with a high basketball IQ, this possibly great for guys like KJ (whilst he was in PHO) and *possibly* Rubio but BAD for guys like Payton, thus part of their fall-out. Add this to the fact that he played in two NBA Finals as a player and PG and could be a great tutor for a player that is very much in the same style, if not better, in *possibly* Rubio.
Petrie said he wanted someone that had NBA head coaching experience and success- Westphal coached seven years, including one NBA Final, and has a solid W/L% (.627).
Petrie said he wanted someone with NBA experience on the whole- Westphal played 12 NBA seasons (making it to the Playoffs all but three times I count) and has also served as an executive and assistant coach in Dallas, amongst other places.
Petrie said he wanted someone that could teach- Westphal coached at the collegiate level with Pepperdine and has traversed the communication gap between established pro and raw, talented kid. While he didn't set the world alight success-wise, his exposure to this type of environment should stand for something. This quality could make him the lead for this job, in addition to his belief in the Princeton offense and relationship with our local mayor. Really, it's a delicate balance. Is it better to have someone with a poor NBA record but a great reputation from the collegiate level, a la Mike Montgomery or Lon Kruger? That's a judgment call.
Hope this helps...