At first, the move to expand MLB's postseason was met with support from both the owners and the players union. Many shared a "the more the merrier" standpoint, noting that other leagues such as the NBA and NHL have 16 team playoffs, while the NFL features a 12 team postseason field.
Personally, I see both sides of the argument. While it would be great to have more series and games, there is the potential for less deserving teams to have a shot at the title. Baseball's regular season is extremely long, which provides plenty of time for the best teams in the league to seperate themselves. It appears that an expanded postseason is going to happen, so we might as well get used to the idea.