I agree with you
The only thing Ben accomplished in this movie was to destroy his own family and ruin a wedding very fast. The "famous" ending provides no resolve. It just poses the question, "What in the hell did we just do?" Where are we going?
Baby Boomer self indulgence. "The Graduate" makes "Forest Gump" look subtle.
Ben is one of the most deplorable movie protagonists of all time. A self-absorbed cretin.