Aww. At the 75% mark, the invaded host actually has a pretty substantial advantage over the hacker because the radius is so small. There are definitely lots of good hiding spots though.
Invasion/being invaded is criminally addictive. I believe some people, including supposedly paid-off reviews, have severely underestimated the depth and fun factor of the multiplayer in this game. Last night, I became away I was being invaded just because I went to my story mission and it was locked (exactly as happens in the "tutorial"). There had been no notification whatsoever because the hack hadn't started, and I was in a car so no phone trick/bug. But trying a mission and seeing the icon turn purple, out of luck... this put me on high alrert and I profiled the hacker in like 5 seconds. However, I had the stupid wrong gun equipped and was firing pathetic long range shots with the 1911, so what should have been an easy kill turned into a narrow escape for him. The game prompted me to hack him back immediately as revenge- um, that is an awesome feature- but then uPlay stepped back in as fun police and I couldn't connect to do so.
I really really want to do some more tailing, but the game breaking bug is too scary, so I won't touch that until a patch.