Probably #1 on my list is Groundhog Day. Just a funny, feel good movie that has some profound life lessons embedded in the script.
Aside from that, I have watched these many times...
Godfather 1 and 2
Terminator 1 and 2
Pulp Fiction
The Sting
Hunt for Red October
Shawshank Redemption
Unforgiven
TMS actors are top drawer. Always go by cast! Very few films, ever, have had such a stellar cast. Many of the stars were at start of their career (when they were cheap). Show me another film which has so many now-seen-as-superstar actors, in actual character parts (not cameos).
I expect there are a few stinkers out there that had some top drawer stars in them. I think it depends on the stars. Some are just content to crank out another film and make millions of dollars while they do it. Others are more concerned with the quality of the film and their legacy as professional actors.
I think more often it is the director. The best directors will be attracted to the best scripts. Then with a great director and script together, it becomes possible to attract the best actors, at least the ones with some integrity.
But as long as we are talking about films with outstanding cast, how about these. I think they compare very favourably with Magnificent Seven:
Kelly's Heroes
Clint Eastwood
Telly Savalas
Don Rickles
Carroll O'Connor
Donald Sutherland
Gavin MacLeod
Godfather
Marlon Brando
Al Pacino
Jame Caan
Diane Keaton
Abe Vigoda
Dirty Dozen
Lee Marvin
Ernest Borgnine
Charles Bronson
Jim Brown
George Kennedy
Telly Savalas
Donald Sutherland
Clint Walker
Magnificent Seven
Yul Brynner
Eli Wallach
Steve McQueen
Charles Bronson
Robert Vaughn
James Coburn