I'm not sure.
Every game in my collection is there because after finding out about the game, researching it, or watching gameplay footage it seemed like I might enjoy it. I only buy games I have the intention of playing, and after playing them if I didn't at least mostly enjoy the game I choose to sell it eventually. I don't have to be in "Love" with every game I own, but I at least have to like them for the most part.
The other thing is there are games in my collection I like for other reasons than how good they are as a game. For example, Dragon Ball GT: Final Bout is one of the worst fighting games I've ever played, however it is a heavily nostalgic game for me since I yearned to own it when I was huge into DBZ in the late 90s and early 2000s. I owned an import copy of it back then, but I always wanted the original US Bandai release. Years ago I finally made this dream come true and despite the game being a total stinker, I love the game for what it means to me personally. There are probably a dozen or so other examples of this also in my collection.