Including DLC, micro transaction purchases, etc. If you got a game for free, please also list your non-infinite next best.
For me it’s Team Fortress 2. $100 total spent on hats and the Orange Box back in the day, 4200 hours plus of fun, meaning 2.3¢ AUD per hour. Initially I thought DotA2 would be my best but it turns out I’ve spent a lot more money in that game than I thought…
My worst is God of War: Ragnarok. Bought it full price for $95 AUD, only played 2 hours and hated it, meaning $47.50 AUD per hour.
Diablo 2 has been the best value by far, even accounting for purchasing it several times over the years, plus the more recent re-make.
More recently, Baldur’s Gate 3 and Hades 2 have been amazing bang for my buck.
Worst might be Diablo 4. I played for a few hours and just couldn’t get into it.