A sonnet based on a Finnish pop song

[RiverNotch]

Close, but the deficiencies in form tarnish the message, methinks. Notes on your meter, plus a few suggestions.
From what I’ve heard and seen, love is worse Missing an unstressed syllable, between "seen" and "love". Modify love, or hell, change it to romance.
than burning war’s ungoverned battlefield. On content: "burning" seems superfluous.
I know by heart its lasting, ragged curse,
its scars that seasons’ changings haven’t healed. On content: I love these last two lines. 
And if I war to keep you as my own,
and losing, fail you in the clamor’s rage,
would I fail? When two are lonely thrown On content: you already said you failed in the last line, so the question here seems rather, well, stupid. On form: missing an unstressed syllable before "would", although in this case this is excusable. Change "fail" into an iambic word with a more appropriate meaning; and yes, the produced opening trochee would very much work here, I think.
out of paradise, or… out of a cage? On form: the statement here feels a bit awkward. The ellipsis is your greatest problem here, though the prosody, too, is slightly out of whack. Perhaps "out of God's paradise-- or out a cage?" 
     Is it a cage, when Eden slowly turns
     into a land of dead-end paths, and all that grows On form: an iamb too much. Also, sonically, I think "dead-end roads" is better.
     there is the thought that everything at last, On form: the break between "grows" and "there" here threw me off. The two are continuous, and there doesn't seem to be a point in breaking them apart, especially with your chosen form.
     by God’s revenge or nature’s need, returns
     to dust? Can love, when its soul flows, On form: an iamb too little. 
     forget the bitter channels of the past?
These last six lines somewhat throws me off. The misses in the prosody seem more like mistakes here than actual choices, and the resolution is inadequate -- I understand that a sonnet doesn't exactly need a clean end, but this ending is both discontinuous and repetitive for me -- answer it.