Instant, immediate, "New Classic". Hands down, 50 cemented his legacy with his first release. Just like Biggie, Ice Cube, LL, EPMD, Run-DMC, Bone Thugs, N.W.A., Scarface, Eminem, Nelly, Wu-Tang, Busta Rhymes, Whodini, Kurtis Blow, and every other artist that established themselves with a classic "first release". Tupac is the only artist that I can think of that kept growing and improving with every album he dropped. It's hard to top that first "Big Album", that gets an artist in the game. I think "Off the Wall", is a better album than "Thriller", but this is "just my opinion".