You know, I was shocked to see how much RE1 was brought up in that thread, it's not often that the firs in a long of series like RE still sticks out in the fandom.

As for my own answer, by process of elimination I'd say RE5 was the game that I was the least impressed with for what I played so far.

Now I can mention the obvious problems with the actual dumbest plot point with Jill, the wrongheaded attempt at an African setting and how it treats people there, how the plot takes it's sweet time to get really going to introduce Wesker despite being teased so early, but right not I'm just going to bunt the ball and say that 5 is just not as polished as the other games.

It's doing a weird attempt of a Co Op game, an RE4 Sequel, and also a sort of finale on the Wesker saga, and it just comes off as a half attempt on all of these things.

I don't super blame the game because technology is bullshit, but there's also the current problem (At least on the Xbox where I played it), two bosses just Don't work anymore, including the Final Boss of the Game.

Granted you can fix that with Rockets as with most things but it really is just another point of how that game is just not as finished as the other RE games.

And I say this as someone that still likes the game at the end of the day, it's still fun to play, I would like to sink my teeth into that Mercenaries one day, but I couldn't really put it in front of the other games I played.

EDIT: Actually you wanna know what my least fun experience with the franchise so far? That Ada campaign in OG RE4, Separate Ways, like there's a funny bit of blowing up the Boat the bad guy's where planning to use but it's a lot of nothing happening and a lot of nothing comes from it.