It is a great system if you want to have a fun little tournament at the end of the season full of excitement where anyone can win. Yippee! If you really want to crown the best team, you've got to put more emphasis on a 162 game schedule and less on best of 5 or 7. But that would entail leaving out some of these wildcard teams and having fewer playoff games and less money. That is never going to happen. In fact, they are more likely to expand this thing than retract it.
Baseball is different than Basketball or Football. In a short series, anyone could win, including the worst team in the league, like Oakland, if they got hot.