Still ownage. ISD's have around 9700 military troops. Not to mention 20 AT AT's, 30 AT-ST's, and more (
http://starwars.wikia.com/wiki/Imperial_Army). MC-80's don't have as much, but they still carry 1200 troops each, and likely have room for many vehicles, and this all comes with a prefabricated base. E Web's would own Big Bro's like they never existed, AT AT's would slaughter Slig Tanks, even Gloktigi would be killed by AT-ST's, regular Sligs would be no match for stormtroopers, (who were apparently actually ordered to shoot badly in Episode IV, in order for the Rebels to escape, and lead them to their base.) and if even one dark force user got on the battlefield.. well, Sith lightning should have some VERY interesting effects on Slig pants. The Empire's predecessors dealt with a Magog like entity before, and I'm sure if they sent a few more ISD's they could conquer all of the Oddworld races.