He's only like DA in that they run a similar scheme. I'm not a fan of the bend but don't break style that counts on turnovers, but some teams do it well and the details matter. They are details that DA too often did not get right at the end of games.
But, I think the biggest problem with that style of defense is that it relies on having an elite pass rush to speed up the QB clock and force him into bad throws. You also need that elite pass rush to stop two minute drives with sacks in critical situations. That's something we haven't had in New Orleans in many years and something that Glenn had in Detroit until Hutchinson got hurt.
But Glenn's personality is a 180 from DA. He's intense and a leader. I'd still prefer an offensive HC and I'd prefer a different style of defense, but I don't think DA is anything like Glenn other than they both run the same basic scheme.