Beyond ballistics, the tactics and complacency is what did them in. Knowing they were looking for skilled, rifle armed opponents, they had hard armor but it was left in the trunk, their only long guns were shotguns with #4 buckshot (IIRC) and at least one learned the hard way that having your gun sitting on your seat in a collision is a good way to be unarmed when you need it. The best shooter was almost useless when he lost his perscription glasses.
As someone mentioned above, the FBI do not handle this kind of stuff on a regular basis, it is better to think of them as lawyers with guns. I say this after working with plenty of FBI field agents in the Bay Area. I would say they are even with most cops, about 2 in 10 are heavily interested in tactics or firearms and the rest are along for the ride. If you want to see some butt kicked by a federal agency look at the US Marshalls, its like night and day between them and the FBI.
