Yes, the Judge Dee adventures are absolutely awesome. Van Gulik wrote his first novel as a tribute to the historical novel Dee Goong An, which contains three intertwined cases, and he then kept this constraint for most of the following novels that he wrote.
And van Gulik's novels are indeed very diverse, with detective investigations, philosophical digressions, fights, romance... I wish I could write adventures as good as van Gulik's novels!