From: Leeuwarden, Netherlands
Light tanks are an excellent investment, and I usually build them as soon as I can. I skip armored cars. I try and remember to use the transport capacity of the light tanks to carry infantry types forward, but do not go into battle with riders aboard. The light tank formations like to have artillery and aircraft around to suppress the AT guns. The AI likes AT guns, and once they appear - Tank destroyers. I hate tank destroyers. They are high value targets for dive bombers.
Totally agree. AT guns and TD's are a major PITA, and should be taken care of as soon as possible. Well, armoured cars can always be used as a screening force, reconnoiter the area ahead of you...although the good ol'cavalry does that job equally well or even better.
Concerning "tankriders", it is my understanding that they soak up attacks. Say you have four tanks on each side, and all take shots at each other. Now add some inf (20 max for four tanks), now the opposing side has to take shots at those too, and every shot fired at your Inf is a shot not fired at your more precious tanks...
It is the same when attacking an Inf unit, or even an AT unit with your tanks; Inf combined with your armour "protects" them.