I was gonna agree, but then I realized the one I was thinking of was
The Rage in Placid Lake, which is really great (and nothing like it sounds like it would be from the title).
Some of the ones that were mentioned that I very much agree with are
Moon, Wristcutters; a love story, A Patch of Blue, K-Pax...
Also apparently I watch Rocket Science and gave it five stars on Netflix but I remember nothing of it, even after reading the description.
Buffalo 66,
Castaway on the Moon (South Korean)
,
Saint Ralph,
Penelope,
The Snow Walker,
Mary and Max (related,
Harvey Krumpet, both claymation)
Children of Heaven (Iranian),
The Iron Giant (cartoon)
,
American Astronaut (!!!!! So good! Cowboy musical in space and so ****ing bizarre.
)
Malice in wonderland,
That's enough for now, but I really like underrated movies.