It's quite a stretch to say that his numbers are obviously Hall of Fame worthy. At best he's a very borderline case and to put a player like that in on the first ballot is as bad as the Harold Baines induction in my opinion.
Consider Edgar Marrinez, who provided significantly more value (nearly 30% more), barely made it into the Hall of Fame. Contemporaries like Manny Ramirez, Scott Rolen, Carlos Beltran, and Andruw Jones were even higher than Martinez.
Joey Votto passed Ortiz in WAR 5 years ago and people still consider him a borderline case. Similarly valuable players from his era are guys like Ian Kinsler, Andrew McCutchen, Matt Holliday and not other Hall of Famers.
In fact, of 11 hitters that got more than 10% of the vote this year, David Ortiz placed 10th in WAR ahead of only Omar Vizquel. Bobby Abreu was also higher.