I'm not sure what a good international manager looks like. It seems like a stupid and thankless job. You have no time with the players so you are really just picking a team and making a speech. Get stuck in, play for the badge, we can beat these etc
I think Venables was good at it because he had the ability to get simple ideas across to players quickly. But modern coaches, and their tactics, physical preparation etc.... it just isn't possible to recreate that.