Price per unit time suggests that the only value of a game is in how much time it consumes.
The value calculus is going to be different for everyone but for me, I tend to look for:
A game which is a game first and foremost rather than an entertainment experience. That is to say: something that demands decision making of me in which I can either increase or decrease the payoffs of those decisions. Games which focus heavily on cinematic scenes, heavy QTEs, or long dialogs disinterest me.
I am often willing to take a punt on a game that tries to do something creative and interesting.
I tend to not like games that demand a high degree of memorization and/or dexterity.
Games which perform well. A recent example of a regretful purchase I made was with Shin Megami Tensei V. I adore the series but the framerate on the Switch really brought my experience down to a level where I just didn't want to play anymore.
The weights of these things will change from game to game and other elements may enter or exit the equation from time to time, of course.