I think Reziger came out ok. He was a hard working full back. Bogarde was a disaster. Other Dutch signings were alright imo. Maybe Ronald de Boer was below par but he barely played. I'd even give Overmars a good grade but he was too expensive (40 mil.).
We just played a very risky game then under Van Gaal and we didn't defend as much as a team so the players were sometimes victims of the system.
Ironic thing is: among all those Dutch signings and millions spent, the best one turned out to be Cocu who had no hype and came on a free transfer.
French signings during that era were far worse than the Dutch btw. Dehu, Christanvaal, Dutruel, Dugarry, Petit. All were utter disasters.