Last two games I pre-ordered were Skyrim, and SWTOR. I got Skyrim based on the fact that I loved Oblivion, and this was it's sequel, in my book ordering a video game based on its prequels makes sense ( if you liked the prequel) The one time this didn't work in my favor was Fable 2 I loved Fable, still do, didn't care for Fable 2, didn't buy Fable 3... but it was then given to me as a gift. meh what ya gonna do but say "Thank You" right? Anyway, SWTOR I got again because of its "prequels" KOTOR and KOTOR 2 were quite enjoyable, and the storytelling was the major selling point of KOTOR the same way that it was in SWTOR, the only reason I canceled my SWTOR sub is because I don't have the time to be a college student AND play an MMO.
So yeah, I pre-order based on sequels, and sometimes it doesn't work out but most times it does (and lets be honest, if I liked the prequel I'd probably buy the game anyway even if I didn't pre-order it.)