Slate puts together a rough analysis of RottenTomatoes actor and director career ratings. They plot average ratings for films in general, actors, and directors, which aren't all that useful, but the Career-o-matic is fun to play with. Punch in a name and see the ratings over time.
[U]se Slate's Hollywood Career-o-Matic tool below to map the career of any major actor or director from the last 26 years. You can also type in more than one name to plot careers side by side. For example, Paul Thomas Anderson vs. Wes Anderson vs. Pamela Anderson. Mouse over the data points to see which movies they represent.
Poor M. Night Shyamalan is on the decline.
[Hollywood Career-O-Matic | Thanks, Laura]