He does. Gaider said that Avernus's research alters the Joining, makes Wardens even more effective at combating darkspawn and demons and pushes back their inevitable corruption by ten to twenty years.
There's a small nod to this in DA2 if your Origins Warden chose to allow Avernus to continue his research, and Hawke gets a bonus--a potion that gives you two points to spend on your stats.
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