Well, coming from a piano player, it does indeed seem that you can't really play the instrument.
It feels very piano-roll-ish.
There's also no sense of direction or dynamics what-so-ever. Some of the voicings are a bit off as well, and there's not much backbone as far as harmony goes.
Mimicking the ability to play an instrument entitles more than just having the sound (or timbre) playing some notes. It involves expression, dynamics, rhythm and harmony.