I was flashbanged elevently billion times last night, gg v_v
The HE grenade is my fave, but it's damage is bizzare. I've had them go off right in front of me, yet sometimes Im left with 30 health and 100 armor, or 72 health, and 40 armor. Odd... but still, it's quite useful.
Smoke grenades = fps dropping lagx0r b0mbs indeed, but also nice in doorways so that sniper doesn't quite know where to aim first.
As for the flash... let the pointman throw one, and DON'T THROW ONE OVER HIS SHOULDER! Otherwise, save it for when you KNOW you have the drop on the enemy and none of your buddies are in teh vicinity.