Happens to me with Half-Life specifically, to the point that a part of me doesn't... want... the third installment of the series. I want to play it sure, but I'm afraid people will be all "OMG TEH GORDONS FREEMENZZZZ" and play it once it's out, without having played the prequels (I'm sure something like this happened with Fallout 4 and Halo 5 lately, and other games in the past).