A fun thing to do is play a 6-player map (or some other map where the mining beacons are far away from the base)
Then, wait till they go to do rare ore. They will probably send a miner, and cargo trucks.
Get some ESG Tigers (or panthers), move them in the path the trucks take to go from the base to the mine, and shut their lights off.
The enemy will be unpleasantly surprised :-)
Or if they send Convecs to build a CC and smelter, just wait for them in their path. The ESG's will kill them, and they will lose the expensive kits inside. (Or do it on the way back if you don't get them right away)
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I also did once, is put tigers all over the map randomly, and shut the lights off. (The enemy starts rolling across the map to my base, and by the time it gets there, 1/2 of the convoy is gone)