As with any airbridge, I suppose there are 3 things that passengers might notice:
Design: how old/new they seem from a stylistic viewpoint
Condition: how well looked after they seem (paint/bumps/carpets/walls/ceiling/leaks/temperature/lighting etc)
Function: Do they work when they are operated?
What I'm saying is that just because a bridge looks old, it might be new and in good working order. And the same for a bridge that looks a bit battered. Then again, a newly repainted bridge or a new-build might not operate as required.