A)The dmg is not based on proximity! it just u Caught in the blast you'll get the full dmg, wee from 4 grenades to 2, or no? i don't know iv'e hit someone 4 times direct on and they didn't die Hmm!
B)The AoE Should be made bigger then the proximity thing would be not so noticeable as they would most likely be caught int he blast radius (WEEE!!),
C)It should have attachments who knows something like different grenade types, Delay,No Bounce,EMP,or add the Grenade type from the campaign
D) MOAR DAMAGE!!!!!!!!