Yeh yeh back me up fam!
Some of the best bosses around too, namely The End, who is so good I'd recommend it for a boss analysis(not expecting this at all tho, worth the suggestion), I mean it's a stealth sniper dual that truly tests your sneaky prowess, tons of ways to beat that boss(even before you fight him).
I love The Fury too, it's a nice stealth oriented boss also, a kin to Vulcan Raven in MGS1, except it's a dark arena with multiple columns that the boss lights up with his flamethrower. But you can shoot the various pipes to put out his flames. Ocelots a fun cowboy dual, I like the different ways you can annoy him, like shooting the bee hive or throw a snake at him if I recall.
What's novel about many MGS bosses is that they are all about pragmatism through unconventional use of the players inventory/moveset, the bosses arena and the bosses own quirks against them. Bosses are something unique to MGS as not many stealth games have them, and if there's one genre that's justified in not having bosses it's stealth(cuz you aren't supposed to get caught or get into fights).
MGS is a dodgey series if I'm being real. MGS1 is more like an arcade game, stealth is super basic and is used to get to and from set pieces/boss fights, which is the meat. Same goes for MGS2, it evolved the mechanics but has issues with samey level design and lacking gameplay, I play these 2 mainly for the bossfights, I've clocked more hrs into MGS2 boss rush mode than the main game.
4 has the infamously longest/most cutscenes out of any game, with little gameplay between them, so you can't really appreciate the changes and mechanics, generally lacking in its design in many areas compared to 3.
Has some great bosses, I've only played this once, I'm not watching ALL those cutscenes next time haha.
5 has superb gameplay but has issues with level design and repeat and lacking content/bosses due to it being unfinished.
Every series peaks at some point, for MGS it was 3, it just so happened to peak really really hard compared to the others:
*Has the best gameplay to story ratio, plenty of gameplay with each area being unique to all the others, some legendary boss fights(The End, The Fury, The Sorrow,The Boss).
*Has the most intricacies and thought to its mechanics, designed in a way to fully allow players to explore its mechanics.
*Great story and cast too, really goofy and charming. Notably The Boss is one of the best female characters around if that's your thing, good character anyway.
*Works well as a self contained entry and prequel that details Big Bosses fall to villainy(before 3 other games about him where made, meaning he has more games staring him than solid snake or raiden).