Finch,
I would think a lander for a gaming site is overkill, no?
For this method of targeting a LP is awesome. You are targeting people that like one thing in order to get them be interested in another. Make a LP targeting people that like XXX and throw on a testimonial about this game being even better then XXX and you are golden.
If you want to get more bold you can claim the same people made it. You wouldn't believe how many toolbar downloads it seems blizzard has brought you.