This article from the Canadian Press quotes various managers discussing how they don't like the unbalanced schedule.
That's the way it used to be, when teams played 12 or 13 games against every other club in the league. It made sense before the wild-card era began in 1995 and makes even more sense now.
The first imbalances sneaked into the schedule when interleague play began in 1997. Those were tolerable, even though teams competing for the wild-card didn't play the same rivals, because of the attendance boost in interleague games (around 13 per cent since its inception).
Then the unbalanced schedule, heavy on intradivision games, was introduced in 2001 so there would be more meetings between heated rivals such as the Yankees and Red Sox, Dodgers and Giants and Cardinals and Cubs.
Omitted from this discussion is the fact that from 1969-1976, teams played teams in their division 18 times and teams in the other division 12 times. The AL switched to a schedule where you played each division rival 13 times and teams in the other division 12 times in 1978. This led to teams playing 78 intradivisional games and 84 interdivisional games.
Disparities in the schedule among wild-card contenders have been brushed off, but grumblings about it are starting to grow.
"It's boring for the players and fans and I think it affects attendance," Houston Astros manager Phil Garner told USA Today.
"Baseball is more interesting with a balanced schedule," Phillies manager Charlie Manuel also told the paper.
Why would baseball be inherently more interesting with a balanced schedule? It might be fairer, but it would be more interesting. There's still the small matter of the two leagues not having the same number of teams and only two divisions (NL Central and AL West) having an even number of teams, so they can assure that they will have intradvisional games on the final weekend.
Even so, on the final weekend there will be the following interdivisional matchups: Colorado at Chicago, Houston at Atlanta, and Tampa Bay at Cleveland.
There are a lot of problems with MLB's schedule. But I don't see what the problem with playing more games against teams in your own division than against teams outside of your division.