The quests have always been a pretty intense mixed bag for me and probably most other people. Especially the older quests, which generally just feel a lot more hostile and petty to your existence overall.
For every fun moment you got out of something like desert treasure or monkey madness, you could in turn have an especially unfun time trudging through any forced stealth segment in this game where the stealth is jank as fuck and doesn't really work properly, or having to deal with those lazy niggers at tai bwo wannai trio not getting you a backup karambwan if you burn the first and generally just annoying you with a lack of hints whilst you aimlessly stumble all over the damn jungle getting them free shit.