The best airport I’ve been through has been AMS. Followed by MSP terminal 1 at about a 7.5, relative. Maybe higher.
I’d put SBN, WRO, MLI at the top beyond that (among those I remember). WRO and MLI are likely because they’re so small.
ABZ was decent. I’d put FRA, JFK, and CDG at the bottom.
Frankfurt was weird. No centralized security stations and they don’t have enough bins when you get to one.
CDG is just a complete mess. I am also finding I despise airports that wait until 30 minutes before your departure to assign your gate. It’s not as efficient as I expected. It’s just asking for people to miss their flight. Especially international travelers who might have issues with WiFi or cell service. When the over breaks down it’s a mess. I got a “You flight is closing its doors in 10 minutes. Go to the gate now” before there was even a gate assigned at CDG. Ran there only to wait another 30 minutes in line.
Amsterdam would be perfect if it weren’t so busy.