Serious question. Almost everyone has understimated them for the past 2 years. And I never saw them (or anyone actualy) running away with the AL East division title this year, but they did.
So what was it?
Luck? I'm done blaming luck for the Orioles' success. I think it's evened out somewhat.
Health? No, they had as many serious injuries as we did. Wieters, Machado and more missed tons of time.
Starting pitching? Nope. Baltimore's rotation was mediocre, as expected. Ours was significantly better. We were better by FIP, xFIP, they were better by ERA.
Lineup? Nope. wRC+ identical. We scored more runs. Yes their lineup is very good, but ours is as good or slightly better despite some serious slumps this year
The manager? Meh. Some will say Schowalter has something that Gibby doesn't. Don't think I agree.
Bench/depth - probably, Pearce alone helped save them down the stretch
I think it mostly comes down to :
Defense - I think this is the main thing. Orioles seem to be much better defensive team. It can take a while to notice this but it sure pays dividends over 162 games. Jones and Markaikis steal hits on a regular basis. Rasmus, Bautista and Melky do not. Even with Machado barely playing, they just have very few poor defensive players, if any. We have several.
Bullpen - Ours was so good last year but crashed down to earth in 2014. Until Morrow and Sanchez stabilized it, it was a major weak spot and cost us many games.