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.
I think for me it’s either Minecraft or Monster Hunter World. I don’t know how many hours I’ve spent on Minecraft, but I assume it’s close to 1000 as I used to play it with friends daily when I was younger. Me and a couple of friends also got Monster Hunter World at the start of the covid lockdown and we ended up playing it more or less daily. I have 380h on it, but I think I’ve enjoyed it more than mc. Both of them costed between 20 and 30 €.
For the worst, if a series of games count then it’s the Trails of Cold Steel series. After playing Azure I was excited for it, so I think I’ve even payed full price for the first or two. I ended up hating everything about them and convinced myself to play through, hoping the would get better, but ended up dropping the entire series a quarter of the way through CS3 when I saw there was no attempt at improving them.