i dont think there is anything wrong with Berry
the problems with Berry are what are around him....
1) recovering from injury, but you cant blame it all on a bad knee and give him a pass and think next year he will get it. he is fine right now
2) lack of talent around him: He literally has Brandon Flowers to his left and THATS IT in coverage. Kendrick Lewis is ****ing terrible, Abe Elam, Travis Daniels, Jalil Brown, Javier Arenas and then NO LBer that can cover the middle to save their lives. Eric Berry gets lost a lot in coverage because of so many blown assignments by these other guys. TEs come over the middle, or release on a out or post, HB delay and release for checkdowns are always wide open.
3) Scheme and Coaching: The coaches are shit and the scheme is awful. He would be better in a 43 or attacking 34. Or a cover 2 where he is playing a Mark Barron role. The guy plays some wannabe Charles Woodson falcon role and he is awful at it. Its only his 2nd year in the league pretty much and this crappy coaching staff thinks hes a 13 year veteran and expect the world from him. They think he's Ed Reed, and hes clearly not. And hes doing way too much with way too little around him