Ya, those filters definitely get clogged up, and they are definitely a bit of a pain to get at. The screws are at least thumb screws which is better than having to drag a Phillips head out, but yes it could have been better.
I also need to replace the top fan on mine. It doesn't usually start spinning on its own, which may or may not have to do with an incident where I dumped a cup of coffee in the thing and smoked a GTX 280 and motherboard
What a disaster that was to clean up. I had a lot of time to think about it and clean though, while I waited for the replacement parts to arrive.