In this campaign you have to defend in the start, and the best thing is to buy a bomber aricraft since the enemy will come in huge numbers and it is very efficient to kill enemy this way. I played +200 hours 's in campaigns and only little online. The AI will almost always do a nice job with recon, so make sure to kill its rec units as soon as you can to blind it, while using your own recon to spot for ATGM teams and planes or attack helos. So, use your air power as often as you can to balance the AI's inevitably superior numbers. On the other hand, it will do very little to protect its own units against your air attacks, often grouping its AA defenses in large formations. The exception is napalm : the AI will happily and liberally employ napalm (and flamers) against your entrenched infantry. It will use air support quite effectively, but never spam it like some players do, so air defense is a priority only if you need to protect precious units. Unless it is so badly outnumbered it is forced to play conservatively, the AI will always attack, so you can exploit this by creating chokepoints, as long as you also cover your flanks from probes. It's not easy because it is very, very good at rushing you with waves of units and will try to find weak spots in your defense and just pound on them relentlessly.
Honestly, I find the campaign AI to be a bit.
