Jesus man, if you wanna have a good old fassioned rummble, go and play Wolfenstein, or CS. This is GTA VC, here we kill in choppers, run over by car, shot eachother, dicing eachother up with chainsaw, and hopefully soon driveby too.
And one more thing, you always see/hear the choppers REALLY WELL, if u can't think at two things at once, then go back to CS. People in chopper are well seen at map, cuz they move often fast/through buildings, and are about always arrow up. I always look at the map and screen at same time, and I'm ALWAYS aware of when a chopper comes, and where it is, and 95% of times how to dogde. It isn't exactly harder to get away from a chopper than from a guy standing next to you shooting you again and again with a shotgun/m60, so u never get chance to do something (that is unfair for sure). Dodging a chopper when the guy in the chopper really lags is much harder though, but that's about the same in all cases (always join a server which has a low ping to you).
Sorry if I'm saying something said 100 times before, I haven't read all posts yet.