Like many here, I love hundreds of groups and as many solo artists but there are debut albums which I've played to death and which are now part of my DNA.
I agree with ChristopherLees and GOS about Let Love Rule by Lenny Kravitz.
Are are some of my faves, which I still listen to this day.
Counting Crows ‎– August And Everything After (1993)
W.A.S.P. ‎– W.A.S.P. (1984)
Pearl Jam ‎– Ten (1991)
Roberta Flack ‎– First Take (1969)
Delphic ‎– Acolyte (2010)
Tesla ‎– Mechanical Resonance (1986)
Platinum Blonde ‎– Standing In The Dark (1983)
Franz Ferdinand ‎– Franz Ferdinand (2004)
Asia ‎– Asia (1982)
Supergrass ‎– I Should Coco (1995)
The Killers ‎– Hot Fuss (2004)
Autograph ‎– Sign In Please (1984)
Pet Shop Boys ‎– Please (1986)
Amber Run ‎– 5AM (2015)
Mötley Crüe ‎– Too Fast For Love (1981)
The Kooks ‎– Inside In / Inside Out (2006)
Elastica ‎– Elastica (1995)
Keane ‎– Hopes And Fears (2004)
S O H N ‎– Tremors (2014)
And many, many more...