One Fu@king Grenade?

You can now throw grenades in 40K...  But only one/unit?  Ouch, my head hurts...  With an 8" range, I guess I'm having a hard time believing that it would be broken, but what would I know :-)...  So much for my Swooping Hawks actually being useful as vehicle hunters...  Now, in close combat, they will wreck just about any vehicle I think just due to the number of glances they can produce at I5...  Guessing they will be my backfield defense for both turns they live...  Though I have to wonder if they will live, but the Wraithguard block out there should draw a lot of fire...