Captains decision has to be final as it is him/her who take the responsibility. Unfortunately despatchers in Europe are no longer given adequate training. One incident comes to mind.
Despatcher lack of knowledge of APS weight & DOW. (Wrong one used on load sheet)
I found it prudent to listen to all inputs then make the decision but have on occasion as above ended up making the decision that caused the dispatcher to "get the hump" .