Let's not discount TV-movies too much. I can think of plenty of TV-movies that are better remembered than a lot of now-forgotten feature films.
Just in the last few weeks, pretty much every obituary and tribute to the late Karen Black mentioned her battle with the Zuni fetish doll in Trilogy of Terror.
And need I mention The Night Stalker
and a certain Carl Kolchak? Or Steven Spielberg's Duel?
And that's just the genre stuff. Films like The Autobiography of Miss Jane Pittman
or That Certain Summer
or Go Ask Alice
were all very big deals at the time--and are still remembered today.
And, of course, there's the future classic that is Sharknado
. . .