The problem with JBJ was that we always waited and waited for the "hot streak" he so often provided over his career. The guy had some of the most spectacular white hot streaks I can remember. Sometimes the length in between was unbearable, but the hope that it was coming, soon, I think kept him playing, perhaps more than he should have.
Some cherry-picked time samples of JBJ's career:
2013:
.395 first 43 PAs
.755 last 64 (not really "white hot."
2014:
.978 first 23 (not really a large sample size)
.506 last 400 (a hint of long term futility, early in his career)
2015:
.384 first 59
.962 last 196, including a white hot stretch of 1.361 over 102 PAs
2016:
.679 first 81
.858 last 554, including 2 white hot streaks of 1.479 in 54 PAs and 1.153 in 149 (overlapping)
2017:
.519 first 77
.995 middle 199
.589 last 265
2018:
.503 first 142/.563 first 251
.793 last 393/ .851 last 284
2019:
.421 first 125
.846 last 422, including 1.057 in a 157 stretch
2020:
.593 first 82
.951 last 135 (1.008 last 71)
2021 MIL:
.594 first 109
.463 last 286
2022:
.730 first 35
.558 last 255 w BOS
He has to be one of MLB's most streaky hitters, and almost always starting off cold.