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.
Best value was thousands of hours in Minecraft for 10€.
Worst was probably something I bought as a child a long time ago for too much money, barely played it and then forgot pretty much all about it. There are a bunch of PSP games that come to mind like Monster Hunter which I just didn‘t enjoy at all.
I bought alpha for $4.99. Same account 16 years later is being used by my kids. I’m easily at 1/5 of a cent per hour for the game.