That was my thought as well when they first presented the system, and claims of "simultaneous identification of up to 8 plates per second" were tossed around.
At first there really did seem to be a problem with either the database backend doing the lookups or the cameras themselves. You could be fully stopped at the gate and it would be 6-12 seconds before the gate would open. They seemed to fix that after a month or two. Not soon after is when they started mounting the cameras I as I mentioned, and one of these is facing a 4-lane 35 MPH road, so it must be working pretty well.
The other problem is the way they have the cameras mounted. Because this was fitted onto an existing structure the camera can only see your plate once your car is only about feet away from the gate. This means you're forced to come to almost a full stop (or just slow way down) to give the gate time to come up.
Since you said you've worked on these systems, can I ask you a question? From looking at the cameras and knowing they work when it's dark, I assume they use infrared light to function. Does that sound right? If that's the case, wouldn't you be able to block them by putting an IR filter over your license plate? Such a filter should be transparent to normal light, so I can't imagine it's (very) illegal in most places.