judging by success I gotta say either 2016 or 2019

Op is asking what year had the best debut albums not the best XXL freshmen

Lil B arguably had a top 3 from 2011 class

2011

Lil B, Kendrick, Mac, Meek, Krit, YG

Cam, Nore solo, John Forte and Sunz of Man debuts.

That had to be a crazy summer. And Black Star.

99 has Wayne, Mos Def, DOOM, Eve, Project Pat and Ja Rule.

Lil b way more influential than people give him credit for tbh..as far as marketing himself on the internet