This is a great question!

I went with over...

But already regret it...

Chances are they will only get 600 innings out of their big 4..
Baseball is a simple game:
You throw the ball, you catch the ball, sometimes you win, sometimes you lose, sometimes it rains.. And at least once a year you lose a pitcher to TJ surgery or a blown out shoulder...

I said under.  I don't think by much, but I see their offense as a little bit challenged at times.  I also see the NL East becoming tougher and tougher.

AYJ, I think that the NL could also become tougher & tougher as a response to the Phillies having such a strong rotation.
Except for Florida the other teams have money. Money & trades should produce some results.

I picked the over. Someone has to win 100 games soon.

Domonic Brown with a broken hamate? That's gonna cost them what, a half-dozen games?

I chose the Under, but not before remembering a scene from Airplane II:

Simon: Gentlemen, I'd like you to meet your captain, Captain Oveur.
Capt. Clarence Oveur: Gentlemen, welcome aboard.
Simon: Captain, your navigator, Mr. Unger, and your first officer, Mr. Dunn.
Capt. Clarence Oveur: Unger.
Mr. Unger: Oveur.
Mr. Dunn: Oveur.
Capt. Clarence Oveur: Dunn. Gentlemen, let's get to work.
Simon: Unger, didn't you serve under Oveur in the Air Force?
Mr. Unger: Not directly. Technically, Dunn was under Oveur, and I was under Dunn.
Mr. Dunn: Yep.
Simon: So, Dunn, you were under Oveur, and over Unger.
Mr. Dunn: Yep.
Capt. Clarence Oveur: Uhh, that's right. Dunn was over Unger, and I was over Dunn.
Mr. Unger: So, you see, both Dunn and I were under Oveur, even though I was under Dunn.
Capt. Clarence Oveur: Dunn was over Unger, and I was over Dunn.