Ravan himself admit he's gonna die before the start of the war, and the justification he gives for that was very baseless and not able to accept.
The war part is very flat nothing intresting just like that war gets finished very disappointed part .
The war part is very one-sided from the begining itself so there were no curiosity for further and it's very predictable.
Author have created more expectation by explaining each individual in each volume but this war of Lanka brought all the individual built ups to a flat level that there is nothing special.