fronzelneekburm: Anything made by Blizzard.
LootHunter: Why?
No reason. I still have the boxed versions of StarCraft and Diablo 2 which I bought as a teen (probably more out of a feeling of obligation - these were the cool games to have, after all - than actual interest in them). Haven't touched Diablo 2 even once in 18 years, I played StarCraft for maybe 10 minutes and then decided I'd rather play something else instead. Likewise, when the WarCraft adventure game leaked, I downloaded it and the zip file has been gathering dust on my hard drive ever since.
I'm sure they're great, groundbreaking games and all, but for some reason I'm not interested enough to actually play them.