I've found the A330 MPS to be useable enough, and not nearly as bad as I expected it to be, but if there's one thing that really bothers me about it, it is that it is a tanker-centric system. I get that I might have to tell a system the entry point fuel for receivers but at the other end of the accompanied portion I want to enter the receivers' destination and the point where the accompanied portion ends.
I want the system to optimise the refuel plan and tell me how much fuel each receiver will have on board at that end point, to meet their minimum overhead requirements.
Otherwise, without suitable cross-checking, an inexperienced operator might accidentally enter the receivers' minimum overhead destination fuel requirement at the exit point, some 500 miles short of the destination.