i wouldn't call the knife build cheating, but if you surprise the enemy, they just die, simple as that.
uhh today, 30 and 3 on wasteland with my 'splosion man build.
tar 21/grenade launcher (thing pumps out the damage without stopping power so it's good when im out of 'splosives)
at4 rocket launcher (wasteland only, DAT BUNKER)
semtex (also wasteland only, i have a hard time throwing C4 in the bunker)
stun grenades
scavenger
danger close
commando (not needed, but i just like it)
uhh and i fucked up with my RPD/one man army build and switched to my knife build....ended up getting an awesome game winning kill with the throwing knife...and got the kill 5 people with the throwing knife challenge completed at the same time.
level 64, next level, RPGx2, FUCK YEAR!