I must admit, Terminal 5 is very impressive, new, and very clean.
However, the rest of the terminals are very poor. Also, the way that ORD is designed, makes congestion very high. Its difficult for planes to get around ORD (gate to runway, runway to gate), thats what happens to most when they are heavily expanded.
The restrooms in ORD (excluding Terminal 5) are absolutely filthy. I get grossed out when I even think of them.
I'm not saying ORD is bad, I think its an okay airport, but it is a mess now.
However, AMS is totally different. That thing has been expanded maybe 10 times, yet its so easy to get around, and very little congestion.
"Generosity is giving more than you can, and pride is taking less than you need." - Khalil Gibran