It certainly is, and that is one reason they play 162 games to determine who makes the playoffs.
No doubt, luck, momentum and other factors play into who advances and wins it all, but the better team does win more often than not.
We can argue about how much more, but I find it hard to believe anyone thinks it's totally random- that it is a "complete crap shoot."
I answered "To a limited degree-but generally not," but "It's half true" seems reasonable, too.
In football, the best team wins more often than baseball, but the one and done playoff format makes it so the best teams don't win all the time.
Basketball and Hockey play series like baseball, and I think the better teams win more often in those sports than baseball.
In my earlier post, I used W-L records to show who were the best teams and who were not, and I realize that is not always a true measure for ranking the contenders. Take the Nats, they were the best second half team but not a top 2 NL team by record this season.
There seems to be very few total surprise winners of the World Series, where a team did not finish in the top 2-3 of the league in W-L and did not play very well at the end of the season. No big trades made them better than their records indicated, yet they went on to win it all.
If it was "mostly" a crap shoot, one would expect it to happen fairly often. Since 2000, I only see the 2006 St. Louis Cardinals as the only eye-opening WS winner. They won just 83 games, that year.
The 2014 Giants were a bit surprising, but they had won in 2012.
People point to the Royals win as a fluke, and the fact that they had crappy SP'ing, made it seem like a long shot, but they had the best record in the AL that year (2nd best in MLB).