In the NFL, rushing 4 is standard. Rushing 3 or less is focusing on extra coverage rather than pressure. Rushing 5 is a blitz. Rushing 6 or more is an all-out blitz (veteran QB's know how to beat this by throwing to a hot route...unless someone comes completely free and blasts him first). I don't mind rushing 4 roughly half the time and rushing 5 roughly half the time. Not a big fan of 3 or less or 6 or more except for rare instances.