Hmm... well I don't know your particular style of movies you like.
I watched Come See The Paradise with Dennis Quaid (made in 1990) the other day and don't know HOW it went under the radar. I thought it was so good. I made my mom and grandma watch it, too, and they loved it. I wouldn't say the acting was like spectacular but Dennis Quaid is a favorite of mine anyways. The first half of the movie is more of a love story, I suppose, but then it turns into a "history lesson", having to do with WWII and Japanese culture. I thought it was great.
EVERYONE has to see Forrest Gump, lol. One of my favorite movies ever. Tom Hanks is the man.
I always have loved Matchstick Men with Nicolas Cage. Another movie that, I feel like, went under the radar but it was great. A con man movie, gotta love it. Loved the ending, the suspense, great movie, IMO.