Just returned from Barcelona and I disliked the airport. With it being one of western Europes busiest a shed with one food place and two shops plus no place to charge your phone is pretty poor, though appreciate terminal 2A, B or 1 may be better than T2C where I was. Some other bad places I have experienced are:
Zante-Nothing other than a sweaty, hot shed with a duty free shop and A cafe with faeces on the walls in the toilets
Heraklion-Just a bigger Zante
Barcelona T2C-For the reasons mentioned above
Sharm-el-Sheikh-Not much seating, very overcrowded and the food places are dodgy with the Chicken burger I ordered looking very like turkey... Though I appreciate this is T2 and T1 looks to be better

There are some places I as impressed by though, such as:
Antalya T2-Big airport that had te right amount of capacity. It is modern and has a lot of food places and a lot of shops. The only irritation was the day I was there, it rained which is abnormal for August and the smoking area was open top, so some areas flooded a bit.
Singapore Changi-Been voted best airport in the world by Skytrax. It has a butterfly garden, it has a river, it has showers and it has lots of facilities such as restaurants and shops.
Heathrow T5-Lots of food places with lots of shops plus two extra buildings. The only downside is the lack of fast food.

Where have you been that you liked or disliked?