After playing a few game against the AI I noticed they are not as brutal as they use to be. Also when I get up a Adv. Radar Sat and get vision of the AI Base and it cluttered with Planes and Bots not moving just sitting in base.
Same here. In the last game I played, the AI's commanders apparently got stuck in landed planes. Or simply decided not to do anything much in general. Not sure which it was.
The AI stacks its forces until it thinks it has a chance to attack you. If you have hundreds of planes above your base then it won't attack you until it has hundreds of bombers.
That already occurs for me when I have about 10 SAM-towers scattered around the outline of my base. The problem in my games seems to be that the AI is very centered on air units and only starts building grounds units (and only bots so far) when the bombers/interceptors are unable to damage my factories. And the planes don't start as long as there are more than 5 SAM-towers in their way so it's getting stuck in a loop of building more aircraft to saturate my defenses and not reducing my defenses with ground units because (it seems) those are only built when a launched air attack gets stopped.