Multi-national aircraft projects, inefficient?

i.e Eurofighter, Panavia, Sepecat, etc..
generally inefficient? Perhaps the BAe/McDonnel Douglas Harrier is an exception where one partner is very dominant..

but in the other cases, the slow down caused by trying to meet the needs of every partner nation, the threat of withdrawl from one of the partners, as well as other sales interest in a state’s own product (i.e Jaguar vs Super Retarded or mirage F1)