The test results you have selected are very old and may not represent the current state of Wine.
Selected Test Results (selected in 'Test Results' table below)
osume.exe (Updater), playing Songs (all modes works perfectly without lags - DirectX used), editing and adding beatmaps, skins.
What does not
Installer, Bancho Online Services (Multiplayer - Scores - Chat - Spectating)
What was not tested
All was tested.
Need to install before using the game (from winetricks):
The Installer don't works then you must install the game on a Virtual Machine (Parallels/VirtualBox/VMWare) and copy the osu! folder in the wrapper.