The raids that I have led on creepside, in general, I haven't found to be much underpowered compared to the freeps we were fighting. If the raid is balanced, I think creeps can stand toe to toe with an equal number of freeps. We shall see in time.
You haven't exactly been fighting freeps with any ounce of skill... I hesitate to call their groups "raids"... rather, let us say, "Camp-Squad-Until-We-Wipe-Once"