What The PS3's library would need to be ATLEAST comparable to the ps2's

[M.U.G.E.N]

hmm isn't this more about will it be able to match the nostalgia of the ps2 era..I mean don't get me wrong ps2 was the best console I have known at the time BUT ps3 has some truly amazing games that makes it shine on its own

the lacking area would be RPG's I suppose but I'm not a fan of RPG's in general bar Valkyria Chronicles...on FPS/TPS/Action etc PS3 is on par imho...