Here some of an attempt heavily inspired by other posts
I number the lines of the poem
(1)Some see de earth vill end times four,
(2)Some see de t'rice.
(3)From vot I've tasted of de four times,
(4)I and zose who know for whom it vas.
(5)But if I must perish twice ...
(6)I am enough of 'ate
(7)To see zat it is for destruction
(8)Zat de ozzer is really won.
(9)Now, vhich is vorth most?
Here are my best interpretations
(1) sum cee dee equals n times 4 $(C+D)=N\times 4$ this gives us one equation.
(2) sum cee dee trice $(C+D)\times 3$, I think since there is no equation we continue with this quanity
(3) from that(i.e. the quantity in (2)) I have taken off dee four times. Now we have the quantity $(C+D)\times 3- D\times 4$.
(4) "I" sounds like $E$ in a thick german accent and $E$ makes sense as it is the next letter after $D$. I think this line is trying to say $E$ from those is not four (i.e. negative four) and 1. $3C-D-E=-4+1$.
(5) $FE$ must perish twice, $FE=-2$\
(6) $E\times N =8$
These all give that $N=3/4, F=-16/32, E=32/8=4, D=1, C=2$ so $E$ is worth the most
Here are some notes on myanswer
! I believe the German accent hint is being overlooked by other answers, and that too many words are being left out. I think the first line must be "some $C$ $D$ is equal $N$ times four". I think the third line must be "from that I've taken off $D$ four times".
My solution definitely goes wrong at "I and zose who know for whom it vas". But I do think this is introducing a new unknown, "I" sound is pronounced as $E$. I think it is too much of a coincidence that "E" is next free letter after $C$ and $D$.
Update: due to hint
(1) $(C+D)\times 4$
(2) $(C+D)\times 3$ or maybe $(C+3\cdot D)$
(3) $D\times 4$
(5) $I \times 2$\
Lines (6-8) give use the values $I=8$, $2C=4$ or $C=2$, and $D=1$.
this gives use the following values for the expressions
(1) $(C+D)\times 4=12$
(2) $(C+D)\times 3=9$ or maybe $(C+3\cdot D)=5$
(3) $D\times 4=4$
(5) $I \times 2=16$
So the fifth line is worth the most!