I am a Placebo fan, but the first album is the one I least play. It's weird so many Placebo fans tend to call it their best...
My favourite debut album of all time, easy one: Crocodiles - ECHO & THE BUNNYMEN. It's so perfect: the sound, the feeling, the imaginary, the artworks, ...
Also deserve a mentioning: The Smiths, Black Sabbath, Bauhaus, Silke Bischoff. All had excellent debuts. For Silke Bischoff, I still think their first one is their best.
Keep it flaming your desire, always rising higher - Aim for stars and hit the sky
(Echo & The Bunnymen - Evergreen, 1996)
Capital punishment = murder
THE PASSION OF LOVERS IS FOR DEATH (Bauhaus, 1983)