I kept an eye on Richards tonight. To me, he seems to play fast, esp. for a rookie. He moves after the snap with little hesitation. He accelerates into tackles. At one point, he drove full speed into an OT and knocked the guy backwards, Panther #71 IIRC, clearing him out of the play so someone else could clean up the RB. Another time he made a tackle deep into the backfield because he had no hesitation attacking the RB and didn't let him make any progress. I'm sure he's overrunning plays here and there - but I don't see it as much as I'd expect given how aggressively he seems to play. In coverage, he always seems to be around the ball, protecting the CBs so they can confidently make plays. I like what I see.
OTOH, I kinda suck at analysis like this since I've never played the game and I don't have a good eye for breaking down plays, so I'd appreciate if one of the other guys who can do that better would weigh in.