Not a very popular opinion, but I’d have to agree.
Love MG1 and 2, MGS1, 2 (yes, even 2) and 3. Hate Portable Ops (later excised from canon) and Peace Walker. The Phantom Pain is a good infiltration sandbox, but a terrible Metal Gear game (its story also basically borrows from Snake’s Revenge, which is a sin on its own).
As for 4, the first couple chapters are the worst, and not representative of what a Metal Gear game should be (I blame Ryan Payton for his “influence”). Some consider chapter 3 a bore (I like it for being a true stealth section), and what follows are some of the best moments in gaming history.
Definitely worth it to experience them as a player, and not just through YouTube videos.