1) % of first pitch strikes
2) % total pitches that were strikes and % of pitches that were a swing and miss
3) average pitches per batter
4) % of weak hits vs hard hits and % of grounders vs fly balls
1 and 4 are important. the % of total pitches that were strikes is good.
The % of pitches that were a swing and miss isn't helpful. Neither is the average pitches per batter.