What's going on? With Marvin Gaye's protest music providing the jolting backdrop for Spike Lee's latest joint, Da 5 Bloods, the following question needs to be asked: What's ultimately going on with this interesting but only semi-satisfying look at four former buddies who served in Vietnam returning to the land that helped shape and destroy them simultaneously. That former sentence is a long one, similar to the loose and winding nature of Lee's film. I personally thought Lee's