It has grown on me big time. It is so much easier to judge quality and relevance from a screenshot than from an icon, and having to click through to compare apps was tedious. It works especially well on the iPad where you can see four at a time instead of one.

I was initially worried about the impact on discoverability, but it seems to have increased my downloads if anything, and I do not have #1 apps, so maybe it hasn't had such a big impact on the number of apps people scroll through. I haven't actually seen any data on this.