Loot Ninja is sure you've seen Tycho over at Penny Arcade rant on the modding in the PS3 version of Unreal Tournament 3. Basically, he thinks it's crap that you need a USB flash drive (or other memory card type) to copy the mods from your PC to the PS3. Loot Ninja could care less about this. Who doesn't own a PC and some sort of memory card these days? It's not that big a step. It's not completely necessary either. If you try to play online with someone using a mod, it will be automatically downloaded to your machine.
What bugs them is that you need to copy one mod at a time via your USB drive. Imagine wanting 25 mods, but needing to make 25 trips with your USB key. Not very fun.