I am owner of all LEGO games. (Except of LEGO Batman 2) Have any LEGO game played through (currently still play LEGO LotR through) and can say: LEGO FdK / PotC has captivated me the most. It was even the only LEGO game that has inspired me to 100% run - which I then did.
Strong buy recommendation for LEGO fans and Pirates of the Caribbean fans. Of course - as always - to better understand, if you know the movies.