I personally have no problem airstrikes and choppers (most of the time). You know when an airstrike is coming so you have some time to react and find cover. I'd say I survive 4 outta every 5 airstrikes. Couple that with the fact people often suck at doing them since they don't have UAV while doing it. Choppers are harder though, but still can be shot down and avoided. I'll admit I disliked them for a long time because I never got any 5 or 7 kills streaks

.
I really got into my stride in COD4 MP around Christmas. Before then I'd only usually kill 8-12 people per map with a K/D of around 1.0. Since then I usually kill b/w 18-25 people per map, even as high as 45 (K/D ratio of 2+). Unlocking the P90 also gave me a boost, I use that like 70% of the time. ty @ long range, though.