There are gaps in the rollcage for the Scorpion, and so you should be able to hit the driver, if not score a headshot.
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If you do miss, use the machine gun until the main cannon reloads. You don't even have to hit them squarely, the blast will kill them if you miss. Ghosts: Use that gigantic cannon to blast them to bits.
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Just be careful if they have a rocket launcher or a FRG, if you are playing on PC, and if they throw plasma grenades. Enemy's on foot: Shoot them with the machine gun or blast them with the cannon.Here's how best to use it against the different opponents in multiplayer (these also work against AI's in Campaign) Good news is that the tank will kill with even a glancing blow from a single tread. It is rather slow however, so don't plan on splattering anyone with it unless you've cornered them. The tank is very powerful (The cannon will destroy most enemy vehicles with even a glancing blow), and the machine gun works like an Assault Rifle on steroids (however the machine gun has a massive spread which makes it very inaccurate and useful mainly for strafing).