without blast shield, they will die..
i know because someone manage to put a semtex on my riot shield and i died because of the blast
but for a frag grenade...it depend, sometime i manage to run away from the 'nades in time

The best weapon still M16A... .. memang terbaik la..

if im not mistaken, it also affected riot shield 'smacking' distance. i already lost count on how many people has been smack by the shield
but the best part using shield is, if you see someone try to rush you to knife your arse...but forgot the fact that my teammate are ready with their assault rifle to shoot their arse   

lol...
if you guys using BT, all the comm & carut will be exclusive to your ears only
or else you just can mute the player..but this one is a doubel sided blade, you may miss out the important message

blinky would you like to join us play tonight... We need a shielder in our team...

Tak tahan beb, tu yang ramai tutup BT.

Ok udah la tu.
Getting most XP in an MP game ,even if you have less kills , or more death:
1. do challenges.
2. Headshot, if cannot, shoot enemies leg, and execute him
3. Stay alive ( You will get the "Longest Life" match bonus)
4. Unlock unknown weapons, like Shotgun. Why ? 10 kills of Weapon challenges, can give you extra 700XP