Well, I give a big 10 on originality cause it's completely new on TRLE
The quality could be a bit better (read my comments for animation)
It is very useable in any kind of level so 10!
The textures look good so 10 again!
There is nothing to say aout the meshes, 10!
The animation is the weakness here. You did a considerable progress since your first grenades but I gave 6 because it is still a little strange... Lara throw a grenade with a little arm move and she can shoot as far as grenade gun(even more:P)I know it's difficult but it would be nice if she was throwing it like a ball...
Aniway..this is a very good item! You did a great job!