Hmm I don't know why so many people are saying that only Lupin and Lonely are nice, I personally think all of the songs are great. Yeah, it definitely doesn't match the advertised concept, but usually in mini-albums, only one song is promoted.
Take SNSD's Tell Me Your Wish mini-album, it was a sexy legs, sailor girl concept. Was the concept applied to the other songs? Not at all. Only for Genie.
Overall I think the album is awesome. Lupin for the sexy and powerful concept they had found back in Revolution album, 3 cutesy songs that is their roots, and one sweet ballad. Hope KARA will own the charts!