+1 Captain Fantastic, some great acting and leaves more engrossing questions than it answers. A funny, sad, enraging and captivating ride of mundane to sublime fancy. Wholly original.
Edit : ^ A Most Violent Year was also great. Excellent acting, Tom Hardy put me in mind of a younger De Niro. Not saying too much as spoilers are easily stumbled upon.
Something I didn’t expect to enjoy too much was ‘Florence Foster Jenkins’. Sad, comical and true. An ‘against all odds’ biopic drama superbly played by Streep. She really is amazingly funny and touching in this role.
My last recommendation is ‘Robot & Frank’. Grumpy old guy with a house/care robot. Brilliant stuff. Novel, unsentimental and well-played. This definitely fits ‘hidden gem’ IMO.