A career .750 OPS is pretty good, given his positional flexibility. And he did have 3.7 and 2.2 WAR seasons with Atlanta, as well as a 4.2 season with Arizona. Seems like he never could manage to master his streakiness, though; and for him sometimes streaks—good or bad—would be season-long endeavors.
Pretty good career—and, that said, it's not over. I wouldn't be surprised to see some solid rebound in his productivity over the remainder of 2016.
The fact that he's had a major career this long says something, despite the journeyman stature. It's just that there was a certain segment over there, like here, who overrated Braves prospects (and not just Shanks!) and indulged in excessive fanboyism.