Judging from what I've heard and read recently, I'd be shocked if they hit the Steelers' win total (including postseason) by the All-Star game. You have to figure they'll hit double digits because there are so many games, but I wouldn't expect much more than that.
Now on the other hand, the pitching could click and they could become quite formidable by the end of the year or next season. A lot of those guys are very raw, so you have to expect a rough start (to put it mildly).
It is the Pirates though, so I'm sure shoulder injuries will be the order of the day. :x