yeah i was recording one i almost put it on youtube i was pissed. had all 4 perks, then BOOM from behind downed in 1 hit i was pissed i spent 2,500 on jugg and it doesn't do anything lol

This is FACT

In the previous maps, if you had juggernaut, no matter if it was a standing or a crawler and no matter wiether it hits as fast as a standing zombie, your health would regenerate too quickly for the zombie to kill you, you could stand with the last zombie for as long as you want (try it if u want)

But when i tried this with the last zombie (crawler, so it doesnt hit as fast as a standing) and my whole screen went red in just 5 hits.

I dont rely on juggernaut and infact when im playing with my friends i save my money, buy an STG and keep my pistol, and save all my money and upgrade both (we camp in the whole area with the STG and the teleporter so i have a reliably ammo supply)
I buy perks after all this.

But to answer your problem, i dont know how a zombie could have killed you with just 2 hits (and if there were 5 hiting you at once, thats 5 hits)
but i believe you. Juggernaut sucks but i guess its still worth it.