Here's an article by Scott Simmons of The Editblog. He takes a thorough and critical look at Premiere Pro CS4's efficacy in a professional environment.
For me, the most valuable insight was raising its media management deficiencies. This won't affect all editors the same way but locating a project's missing media in Premiere Pro has long been a challenge. Although as the article points out, Final Cut Pro suffers from the similar problems.