No it is not.
Not illegal but hacking the ps3 is but this is a grey area of the law. It will get your account banned as it is against the t&c of IW and sony.
usually capital punishment, depends where u come from really...
No more Mw2 Challenge Lobbies on Ps3 because of the new Ps3 Patch.
There are so many hackers on MW2 that Infinity Ward can't stop them.
when someone is leaving if they are the host that would mess up people or if someone is hacking and if your internet speed is very low and you would sometimes get kicked
Yes, hacking any game on PS3 could damage your PS3. Not only physically, but using hacks can get you banned from PSN. Also hacking your PS3 is illegal and can get you in trouble with Sony.
you cant
Yes
if u have ps3 add ownupwnu69 for mw2
Yes. (almost as good as the XBOX 360's mw2)
No, there is no infinite health glitch for MW2.
Why would it? Its a dvd.