Forum Moderators: Robert Charlton & goodroi
Complex urls may not get quite as many click-throughs, and over time this might be a slight ranking deterrent. However, that's a user related metric, and not something inherent in Google. Well crafted titles and meta descriptions can usually compensate for that minor factor.
Here's the big picture: even with dynamic urls, a site's pages can rank extremely well and pull in great Google traffic.