1. uhhh
2. don't know
3. Pretty sure every PS3 can play PS1 games, PS2 games are done by emulation and I'm not sure about the newer ones.
4. There are some PS1 games available via PSN, yes. Yes, all PS1 games available on PSN are playable on both PS3 and PSP.
4b. What the hell is an MSG game? If you're asking about the Metal Gear Solid games, no Metal Gear games are available for download as far as I know.
I've actually been getting some good deals on really old PS2 games from Gamestop at about 5 bucks a game, as well.
I mean, I got the entire Jak series for about $16
they all even had the manuals and original inserts
oh yeah, that's right
I never did like heretic as much as doom
maybe it was the lack of awesome music
and maybe the lack of enemies (seriously go from final doom to heretic and tell me there isn't a serious lack of enemies in heretic)
iddqd
iddt
idbehold - i,v,b,r,a,l
idchopper (what a useless cheat, I mean you almost always have the damned thing by the first or second level)
idclip (Doom II)
idspispopd (Doom I)
idclev##
idkfa
idfa
did I miss any
idmus I guess
Y'know, I just realized the last time I took a number rating seriously on any game was when my PSM subscription ended five years ago.
I've been totally relying on the opinions of people I know personally, since.