When Cliffjumper starts up the battle, you will find yourself caught in a swarm of Insecticons as Soundwave makes his exit. You will automatically drop down to the lower floor, where you will find a Scatter Blaster shotgun and some secondary ammunition against the back wall. Grab the Scatter Blaster right away; this weapon certainly has limited usefulness, but this battle against the Insecticons is definitely one of those sections.
Use a combination of the Scatter Blaster and your melee attacks to get up close and personal with the enemies. Hit them with your melee attack to flip them onto their backs where possible, rendering them temporarily stunned and unable to strike back. Use this technique to manage to crowds as they come. If you need to, switch to a more explosive secondary weapon to clear out the enemies in groups. You should have the first wave over and done with without much trouble. Refill while you still have time, using the ammo pools towards the back of the area and the mines in the Armory Reactor along the left side of the wall.
In this second stage of the battle, more Insecticons will flow in from holes in the left and the right sides of the stage. As you wear your way through the bad guys using your Scatter Blaster, explosives, and melee attacks, flying enemies will buzz in from the center of the arena. Use your more projectile-based weapons to knock the flying enemies out of the sky. As you do so, keep your eye on the ground, as large waves of spider like Insecticons will still be flowing in from various points in the arena.
If you get a free moment, be sure to check in the back right corner, past the hole in the wall through which some of the Insecticons in the last wave were coming through, head back there and to the right to find a pile of crates containing currency.
After you defeat all of the Insecticons, you will have to escape from the facility fast. Transform into your car form and boost out of the gaping hole in the back of the area. Follow Cliffjumper, who will have also transformed to his vehicle form, down the flaming wreckage of the hall and to the right, around the corner. Insecticons will try to get in your way, but you can simply plow through most of them. Keep to the right as you come out into the open, and take your finger off of the boost as you round the heavy curve ahead. Proceed through the room and boost past the enemy Insecticons and outside just as the base explodes behind you. You will land right in the dropship, and with that you and Cliffjumper will be on your way out of the bae.