I’ve recently had the opportunity to compare Greek life at Dartmouth vs other schools (i.e. Vanderbilt, U of South Carolina, etc.) and there are some pretty significant differences. Unlike many schools, Dartmouth students don’t rush until Sophomore year. Most parties at frats/sororities are open to everyone with a Dartmouth id - you don’t need a specific invitation and, unlike some places, unaffiliated guys can go to frat parties.
In addition, many of the houses offer financial aid for membership dues.
Housing within the houses is usually based on a point system where points are awarded based on your contribution to the house. For example, President gets x points, House Manager gets x points, etc. During Sophomore summer, sophomores have the opportunity to hold leadership positions and often that translates into leadership roles in Junior year. Roles are held based on the calendar year so you’re elected in Jan and hold that role until Dec. Also, rooms within the house are for 1-3 people, not the barrack like dorm rooms at some other schools.
Freshman and sophomores generally live in dorms, Juniors can live in the house or dorms and Seniors live off campus. Dartmouth Financial Aid can be applied to any of these options.