Are you guys forgetting Revans best advantage. He has thousands of dark jedi in his army, plus the powerful star forge droids (if those droids can take down jedi they can each kill 100 of those stupid storm troopers lol). Whoever said the empire had a larger force? Revan had the Star Forge so that means he'll have more ships. Also Revan is a brilliant military leader.
Looks like someone hasn't been reading the topic...
1) He has thousands of Dark Jedi in his army. Yet none of them are really worthy of recognition outside of Revan, Malak, and Bandon. If they attempt to take part in a space battle, then these "thousands of Dark Jedi" are overwhelmed by sheer numbers. If they take part in a land battle...Well, let's just say that the ground isn't a good place to attempt fighting a Star Destroyer in the sky. Not to mention that the Empire isn't exactly short on Dark Jedi. And most of them are pretty decent quality Force Users, as compared to the nobodies we see in KOTOR.
2) Again, SF droids aren't that useful for anything but land combat. Even assuming that they are used, being able to kill Jedi (I don't recall them doing so, but I'll wait for an example before saying otherwise), that doesn't specifically mean they can kill stormtroopers. Jedi and regular soldiers fight in very different styles. Taking down a single Jedi with a lightsaber is different than facing down concentrated fire from dozens of troops.
3) The Empire clearly has a larger force. Revan's military wasn't able to overpower the severely weakened Republic (Y'know, the one that just went through a war with Exar Kun and a war with the Mandalorians before Revan took 1/3 of its forces and turned on it). The Galactic Empire, at the least, has 25,000 Star Destroyers, which outmatch even Revan's Leviathan models by a vast margin. And you really don't want to get the Executor or Eclipse Dreadnaughts involved in this.
4) This has already been addressed several times. Yes, Revan is a brilliant military leader. But the empire has roughly a dozen strategists/tacticians on Revan's level, as well as two who are superior to him.