The Scourge does need to be stronger, it need more hp and they need to do more damage, they are way way to week, if u make an army of them like 10-15 4 turrets can take them out easy, i think they also need to be faster

so they can get past obsticals easyier like units and stuff, but if it was strong in health damage and was faster, i think they should increas the ammount of minerals and gass it cost

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And why would you send scourges into 10-15 turrets in the first place? Are you still playing money maps? (bleh)
Anyway, the key, as Spaceboy2000 pointed out, is to use them WITH other units. So when you are fighting an air war, use devourers or mutalisks to draw the initial fire, then you grab those scourges and shoot them in and it should help... a LOT. The devourer's attack helps scourges a lot. Since the attack speed of enemies are slowed down, more scourges can get their targets since it takes longer to kill the scourges.