The 2-3 man pass rush never, EVER gets pressure on the QB. This is the reason so many second string QB's look all-world against our D.
Second, D-Linemen can't possibly shine in this scheme. LB's do when they are sent on a blitz. But linemen are nearly always double teamed and have no shot at the QB.
Third, it makes our DB's jobs so stinking hard. When a QB has all day to throw, any receiver worth his salt can get open.
This scheme frustrates me to no end.