Sonically you could argue it's not a strictly Hip Hop album, but for the past 8 months it's been my go to for days when I'm feeling down. I differ from you though as I like albums that finish with a bit of optimism, like this one. Without that glimmer of hope I might end up wallowing too long.
I'm also a big fan of the albums/mixtapes young rappers drop right before they make it big. Those might actually be my favorite subgenre in Hip Hop. There's a palpable feeling of hunger, doubt, stress, worry, seeking and questioning, almost as if it's all chips in and if the album doesn't succeed they'll give up rapping. These albums also set the bar really high, and in many cases it's hard for the rapper to make a follow up that matches the intensity. Examples:
Kendrick with Kendrick Lamar/Overly Dedicated
Blu with Below The Heavens (Her Favorite Color & ParieArtNomee deal with depression more though)
Big K.R.I.T. with Krit Wuz Here
Freddie Gibbs with Midwestgangstaboxframecadillacmuzik
Tut with Preacher's Son (highly slept on, it's been in rotation for months).
Ab-Soul with Control System Isaiah Rashad with Cilvia Demo Schoolboy Q with Setbacks
Also gotta mention rappers like Open Mike Eagle, Quelle Chris, Kid Cudi, zeroh, who are able to express depression without it being too overbearing.