Finished MGS 3, if I'm honest with myself I didn't enjoy it as much as I remembered enjoying it 20 years ago. Up to The End is good, but from The End to the end it's pretty dull, briefly frustrating and then it ends on a high note with The Boss fight, then the never-ending ending is dull again.
I'm pretty sure most of the long chats happen right at the end, The Boss recapping her life is like come onnn let's just fight so I can go home! Basically, the pacing is thrown way off. Early in the game it's good; you do a bit of stealth, fight a boss and it maintains a good tempo. Then, after the Volgin fight, you do a chase, fight Volgin again (on rails, repeating the same actions maybe 10 times), fight Volgin again (except you barely even need to move, again repeating the same actions over and over), do another chase, then a chase but on foot this time, listen to lots of talking, fight The Boss, listen to lots more talking and then find out you're a pigeon.
I had the same criticism of MGS 2, and MGS. MGS 4 as well. Not MGS V though because instead of trailing off in the third act, the third act just doesn't exist.