The AI is extremly careful when planning invasions. Any decent defence force along the beachheads will make it ignore the area and look for a weak point somewhere else. It also seems to consider air support and cover when planning invasions.
IF the AI manages to find a good spot to attack, it does a good job (at least against other AI) with multiple landings and linking up the beachheads. It will, however, run into supply problems if additional ports are blocked and can be lured to land when you are keeping your defensive units behind the coast line.
IF the AI manages to find a good spot to attack, it does a good job (at least against other AI) with multiple landings and linking up the beachheads. It will, however, run into supply problems if additional ports are blocked and can be lured to land when you are keeping your defensive units behind the coast line.