I think espadrilles can look good with shorts and summery stuff. I know they're not for everyone. I don't think you should pay a lot for them though. inexpensive versions are the best.
I like them with linen pants and or lightweight jeans, with shorts I feel like a tourist. There are days I just don't want to have my feet constricted in shoes/boots and its either thong sandals or espadrilles for me. I actually really like the way they look and deflate after time. I only have two and have used them year round so I didn't mind paying the Castañer price since they get plenty of use