The Master Chief Collection is nice, but if you've played Halo CE/2/3/4, then you're definitely not experiencing anything new, besides the updated graphics for Halo 2 (which are beautiful, by the way).
That said, multiplayer from all 4 games is back, and there's a lot of Cplaylists you can join for either campaign or multiplayer where you cycle through maps/missions from all the games.
It's kinda interesting to do some of the campaign playlists. There's a Flood playlist, where it's every Flood level back to back, as well as a Finale playlist of the last 4 missions (which for the most part consist of driving/flying around), and UNSC playlists set on as many UNSC locations as possible.
TMCC is nice, and you could really enjoy it, but for my money I would go for something entirely new to yourself.