I'm not a fan of the shooting-grenades-to-detonate them, personally. It's a fun idea that unfortunately leads to nothing but cheese. The ease with which you can throw a grenade then detonate it mid air in someone's face with no chance to dodge using hip-fire is plain silly. If they wanted more realism it should be shoot the grenade to disable it (a torn apart grenade that still manages to explode would do less damage, not more). But Honestly, I think they should just be non-shootable.