Hitting #1 in its first week, All Eyez On Me by 2Pac, is one of the most highly-regarded rap albums ever. 1996 was peak Gangsta Rap, 2Pac was a genre-defining Gangsta Rap performer, and All Eyez On Me is one of the best examples of the genre.
I've never been that into 2Pac. I'll enjoy a play of California Love from time to time, but I am not a 2Pac aficionado. The last rap album I reviewed (by Easy-E) I didn't particularly like and I felt it was poorly made. Conversely, I can tell that All Eyez On Me is a high-quality album, and while I don't listen to it very often, I don't think I will never again listen to it. If you want some Gangsta Rap, you can't go wrong with this album.