Right, it's ninja that protects against heartbeat sensor, my error. I use cold-blooded but it's still pretty useless in hardcore. Very few UAVs, fewer sentry guns, and higher level killstreak rewards are a lot less frequent so not many predator missiles or helicopters to worry about. This is both because people camp so they get killed less, but they also kill less.
IWNet was having problems around Christmas time, maybe with all the kids out of school they flooded the servers, who knows. But it's been working well lately for me.
I wonder, since you're in Europe and someone like Psyke is in Singapore and I'm in the US, will IWNet ever match us up together in a game, or will network speed limitations prevent this?