I agree. For me, graphic novels tell, and have been marketed as, new, self-contained stories, such as A Contract With God, Sabre, Detectives Inc, Death of Captain Marvel, Arkham Asylum, Catwoman: Selina's Big Score, Sgt Rock : Between Hell and a Hard Place, or Jim Starlin's more recent Infinity trilogy, rather than single volumes reprinting already-published material.
There is the original graphic novel (OGN) vs. graphic novel distinction, with the above examples falling into the first category, and collected editions of existing, episodic material such as DKR and Watchmen in the latter.
I still prefer OGN vs collected as the more accurate categorisation.