Infinite Jest aside--that novel is in a league of its own starring Geena Davis, Rosie O'Donell, and Tom Hanks as the foul-mouthed ex-ballplayer with a heart of gold--this is best thing I've read all year. Here's why:
a) First, it's beautifully written. Robert Coover is often grouped with D Barthelme and J Barth, but he's a clearer writer than the former and a better stylist than the latter. On the strength of this work, I picked up a cheap copy of Pricksongs and Descants, a collection of Coover's short stories.
b) It's the best baseball novel I've ever read. Eric Rolfe's Greenberg The Celebrant was a wonderful bit of historical fiction, and The Natural was a brilliant dark allegory, but both concerned baseball as a spectator sport--the "American pastime," in other words. The UBA, on the other hand, concerns baseball as a record-keeping activity:
"So...he'd found his way back to baseball. Nothing like it really. Not the actual game so much--to tell the truth, real baseball bored him--but rather the records, the statistics, the peculiar balances between individual and team, offense and defense, strategy and luck, accident and pattern, power and intelligence. And no other activity in the world had so precise and comprehensive a history..."
"I found out the scorecards were enough. I didn't need the games."
c) It's the best book about the weird, imaginative, and esoteric obsessions that characterize the private lives of many nerdy males (even "normal" ones like Henry Waugh, who are capable of holding jobs, talking to people, etc.). Waugh, for example, invents a game that is really much more than that, as evidenced by the fact that his friend Lou Engel, upon being invited to play it, finds it neither enjoyable nor interesting because he can't "fill in the gaps" between dice rolls with invented storylines in the same way that Waugh does. I've gone through two such phases, first with "e-wrestling" from 1996-2000 and now with the Moustache Club of America (2002-2011)...and I can attest to the fact that the loneliness that accompanies such hobbies is simply ineffable.
d) And finally, when the novel arrives at its absurd conclusion in a league future that's become completely unmoored from its past, tUBA provides an excellent commentary on history:
"Can't even be sure about the simple facts. Some writers even argue that Rutherford and Casey never existed--nothing more than the ancient myths of the sun, symbolized as a victim slaughtered by the monster or force of darkness. History: in the end, you can never prove a thing."
And on agency:
"Beyond each game, he sees another, and yet another, in endless and hopeless succession. He hits a ground ball to third, is thrown out. Or he beats the throw. What difference, in the terror of eternity, does it make? Why does he swing? Why does he run? Why does he suffer when out and rejoice when safe? And when, after being distracted by the excitement of a game, he returns at night to the dread, it is worse than ever, compounded with shame and regret. He wants to quit--but what does he mean, 'quit?' The game? Life? Could you separate them?"
If you don't understand or like baseball, speculative gaming writ large, and the like, you probably won't appreciate tUBA. Other reviewers on GR haven't, citing such reasons. But if you do, you'll quickly realize that this is one of the best books written in the last 50 years.