I am talking about some game where you went in with low expectations, just to "give it a shot," or maybe some friend dragged you in, and you expected the game to be sub-par. But it turned out to be really good after all.
For me that game was GW2. I only signed up to pass time while waiting on something else. But I ended up liking it. For a few years at least.
EQ1, EQ2, SWG, SWTOR, GW, GW2 CoH, CoV, FFXI, WoW, CO, War,TSW and a slew of free trials and beta tests