Ramming can be quite a good tactic in many of the games... Of course, if you're stupid about it you can get yourself killed... but done intellegently it works rather well.
Indeed. In the early WC4 missions, if you take a Banshee's shields down and damage its armour a bit, you can nudge it to death without even scratching your paint. Heck, even when you fly the Banshee, you can still kill things by ramming and get away alive (though not without damage).