Nah it's not that bad mate
I had an Antec 160WP that had those elongated flutes (they were vertical though) and the dust loved to gather there in abundance. There are just a few design 'issues' that stick out at me on first appearance. I do like this though as it allows for a virtually uninterrupted supply of cool air over your hard drives.
Some cheaper case manufacturers have the swiss cheese metal effect in front of the fan that adds to overall case noise.