On reflection - having read the posts that followed mine, I realise that this is a more complex question than the OP suggests.
I don't think it is possible to quantify a loss of human life against a military objective and say 'it wasn't worth it' because that would belittle the sacrifice that was made.
But similarly to say that the military objectives were achieved as designed is also false, because it is impossible to quantify, even broadly for a number o years yet, so one cannot say it 'was worth it' either.
I am often accused of living in an idealised world, but I don't. I simply strive to see a view that does not involve death on a massive scale, because the decisions that lead to that are made by men just like me - they all close their eyes to go to sleep, they all put on their trousers one leg at a time in the morning, so if I can look at a different way, it follows that they can as well - and if enough people do so, on both sides, this colossal waste of life can be avoided.
These men and women remain as dead as they are now - whether it turns out to have been 'worth it' or not.
And that is a tragedy that cannot be forgotten.