No coupled VNAV, poor fuel economy (no future, will be back in desert soon), underpowered (have fun throwing pax off for fuel constantly), perfunctory “FMS,” structural 250-below-ten in a world where you are always restricted at 250, .78 structural cruise in a world where ATC needs you at .80. Mainly those things. It is obsolete in a few charming ways too, but those are the ugly ones.