I think the early H&M designer collections were really good, but I have been rather disappointed by several of the more recently, unfortunately. But I think the Isabel Marant collection is rather good, because it's true to her style as I know it, but it also feels very suitable for H&M, which is a good thing, if you ask me. I guess this is something that might not be appreciated by those who buy from H&M's designer collection in order to get something more luxurious or fancy, though, because I wouldn't exactly call this collection very luxurious, it's more like H&M's style usually is, I think.
That said, I do think the collection has some cool pieces, though I can't say I love them all. This jacket is pretty cute though (and very Isabel Marant, somehow):
I definitely see an improvement compared to the last collection, though, which is really nice! Keep it up, H&M!
(images from Vogue and Dose)