I agree that Pynchon is unsentimental, but when I first read "V" as a teenager, tears rolled down my face as I finished the chapter entitled "Mondaugen's Story" (and to quote Billy Wilder: I laugh at "Hamlet"). Pynchon along with Faulkner seem to me to be writers who are so capacious that their works rather than providing refuge for a reader, grasp the reader in a robust embrace of experience and intellect.
In contrast, DeLillo is a writer that I find "cold" - precise and sharp prose, but distancing, as if as a reader I am to look but not touch.
Brian