I used to think i like RPGs in general and then only much later realised i only like Fallout and Arcanum and was only playing RPGs hoping to find something similiar and miserably failing at it.
This isn't me really, but I definitely identify with it. Those kinds of games are so above all other RPGs for me, I despair over how few are like them.
I feel somewhat similarly with FPS games. I mostly like ones with RPG or "immersive sim" elements and try to convince myself I love stuff like Quake, when really... eh, it's okay.