As I have previously stated in other posts, when Tanaka pitches you can sit back and watch the game. He make scuff here and there but he does not blow his cool.
...aside from having very good stuff, Tanaka is very resilient. He doesn't walk many because he does not give in to hitters even when behind in the count, so he's gonna give up some hits and HRs but again, since he does not walk many batters, the damage is usually minimal.