In baseball, any team is likely to beat any other team on any given day more so than in the other sports. It is difficult to sweep series, even against the bottom teams. Nothing should be taken away from the Sox during their nice run since mid-May. As I said, they did what they had to do.
Considering that they play each other 19 times each, I think that it's impressive that 4 out of 5 teams from the AL East would currently be in the playoffs. I agree with you that Baltimore is not the doormat that they used to be. They have a pretty decent bullpen.
I like to look at run differential. Every team in the AL East besides Baltimore has a positive run differential. In the AL Central, only Minnesota has a positive differential. In the West, Houston, Seattle, and Texas have positive run differentials. Based on that, I am more inclined to think that a team from the West might sneak into one of the wildcard spots over a team from the Central, but I still like the chances of all 3 wildcard teams coming from our division.