Put the useless Macbook to the trash and buy a real PC. 
If it's for gaming, I agree with this.
I have a PC for stuff like this, but try CrossOver, and WINE. Bootcamp is for dual boot, so you can also try that. I've never really tried to game on Macs, besides MineCraft. I've heard that the GTA III trilogy is on Mac though. I would really recommend a PC for gaming though, but that's just me. I use my Macs for the stuff they were made for. Music, videos, and graphics design. Mac machines are not gaming machines regardless of the effort they're trying to put behind it.