Actually 'Other 737's' comparison is not an argument to me. Why? We don't have more realistic 737 for XP than IXEG, and FS/P3D platform has nothing to do with 'realistic taxiing'. Remember to change controls sensitivity in X-Plane joystick settings from 50% to recommended 25% - it changes a lot and might be a reason of your opinions.
I have few hours in EASA certified sim as well - it is very responsive.