The worrying thing is that MAN are unable to make what they have work, so any new or upgraded facility will naturally be subject to the same culture. T2 is still relatively new so no excuses there but a constant "make do" approach and lack of attention to detail (inoperative equipment) ensure a variable and often mediocre passenger experience.
Old terminals are outmoded but there is insufficient space on their footprint to create anything truly impressive or indeed "world class".