I don't want to look like a total jerk but i heard from someone whose sister is married to an important rav that the OU kashrus is not so reliable as you might believe. they depend on paperwork that could be phoney and don't really inspect on the spot or don't go there enough and maybe some of them even are themselves not as conscientious honest as they should be. does anyone know anything?
The OU is a very reliable Hashgacha on which ALL Hashgachos rely. If you eat anything processed in any way then you are eating food that is certified by the OU. They have many big Gedolim who are in charge including Rabbi Belsky, Rabby Genack, Rabbi Schachter and they are absolutely reliable. They may have standards which some people disagree with (Cholov Stam for example) however they are 100% reliable, they do not hide their standards, and do not play any games.