Well for the big guys i would try to get to them for CC before they blow you out of the water. You shouldn't have any problems killing the gaunts, but try not to get over confident, as numbers is a main factor. Deep Strike any units you have (that can) to get to them quickly, have any Termies kill the Tyrant, they have a better chance.
Also, don't use IM speak on here please. Makes you look bad.
Also, don't use IM speak on here please. Makes you look bad.