I found this to be very interesting, and backs up what I have seen of Atogwe (I'll be the first to admit, I have only seen maybe 3 Rams games, but I have a friend who is a Ram fan and has hyped this kid up, so I have paid attention and watched when I could) He is great in playing the ballhawk role, but anything involving stopping the run he is not even average.
http://ramsherd.com/2010/06/01/farewell-to-atogwe-the-difference-maker/
There is a lot of information on there, but it shows how the Rams performed against the run and pass with each of the Safety pairings last year, depending on who was playing due to injuries. Most noticeable is how poorly they performed against the run when Atogwe was playing, and it was not even close. Anyway, just thought I would share that with you guys. Pretty interesting read.