Looking through all the kits I was pretty disappointed by the Adidas ones - to me the designs seemed kinda outdated (similar to those ones that are usually on sale at Sportslink/Royal Sporting House) if you compared to the other kit manufacturers.
I'm most impressed with Puma's - although they got some horrible ones (see Cameroon and Algeria), they got my favourites in Switzerland and Chile (below). I think that Puma did have the effort to try to provide a identity in each of the designs (although they made them super tight-fit, not wearable for normal potbellied humans).
My award for worst kit goes to...
I love cheetahs but it looks like the kit is full of oil stains like when I was tearing apart freshly fried chicken wings.
Iran.