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Most of F2P games are almost a clone of WoW, and I have played it so many years that finally I have ended bored of it. So, when I'm looking for a new game, I tend to discard all of the F2P games and just look for single players, non-persistent online games, free MMOs and MMOs with monthly fee.
So I ended wondering myself. If we take out the F2P games and we look for nice MMOs, how many of them remain? Of course the quality is subjetive but we tend to remember those which had something special for us. Something that kept us playing them. There are over nine thousand games but if we think it, there aren't more than 20 games that meant something for us, the other are "bleh, it fills the gap"