No, I didn't mean the look. In terms of layout, the HOLP maps are generally simple to learn yet effective. Things have a purpose and it works. Many of UT3's maps, especially the more complex ones, don't feel as if they have a purpose. It's like the layout designers just went around going, "Oh, I guess we need a hallway here or something." The layouts themselves lack any sort of memorable character and often deadend themselves or get connected in strange, unintuitive ways. Many times things are blocked up unnecessarily and certain areas are completely devoid of pickups and tactical worth.
That's the feeling I got, at least. D: