I wonder if you have seen it yet, you can rate replays and comment them too. Plus you can get a map preview by clicking on "show map". Why this extra click instead of showing it directly?
Because a map image is 100-300 KB, (up to half a minute with modem) even more on some maps, and users with slow connection don't want to have that extra loading time if they don't need to.
And there should be a "click here to see preview" on the actual image too. As it is now you get the feeling that the replayuploader was lazy and dint put a ss of the map. Know what i mean? :9