The 1-game play-in is a monstrosity.  It might work in NCAA, the Olympics, or the NFL, but for a league that features a 162-game sked, and is so pitcher-dependent, to have a 1-game winner-take-all playoff is no good.  Makes a mockery of the entire season that some barely .500 team could steal the 1-game play-in, then get hot and get to the WS.  They shouldn't be even allowed in.  The 2nd WC team is a diversion, to create some excitement, the illusion of a race to make the post-season for also-ran teams.  

I get the 1st WC team, there could be a team finishing 2nd in its division with a better record than a team that won its divisio.  You can make a case for 1 WC team, but not 2.