While leading up to this weekend's storm, the GFS was everyone's favorite punching bag. While it certainly made mistakes as it related to QPF output, it's idea on MSLP positioning was more right than most. To simply disregard it due to some past experience is the opposite of what you should be doing as a forecaster. Take your emotional biases out of the equation, or better yet maintain a log of how your tier model lists have performed from a QPF and MSLP location perspective, and I'm sure you'll see that a change is in order.
Best of luck!