Dickinson's facilities are very impressive, with most buildings seeming new or recently renovated. The baseball field is immaculate, but definitely off campus, about the same distance away as F&M. The fieldhouse was very nice, but we did not have the impression that baseball had carved out it's own space - drop down batting cages in the middle that in the winter would have to be shared with other sports.
Gettysburg has a brand new wing of their main athletic fieldhouse, and the weight room was impressive. The part of the fieldhouse that baseball uses for indoor workouts is literally right in between the weight room and the field - all very convenient.
In general, and please keep in mind this was based on only one half-day visit, the student body at Gettysburg seemed more blue collar and sports-oriented, at Dickinson more artsy and global, and at F&M more NJ/Philly.
I will say that we've heard from other sources that the housing at F&M is inconvenient and not liked by the upperclassmen, at the other two nearly everyone lives on campus which makes for a better community. One negative for us at least is that at Gettysburg evidently the entire baseball team is all in one fraternity. I would think those guys would spend enough time together without having to also live together.