Best place I found on that one was up on the platform at the ferris wheel, crouching at the railing. Just watch for guys coming around the right and you should be ok. The railing seems to give decent cover from incoming. Also remember you've got tons of C4 and claymores. Oh, and when the choppers come in they're not completely synchronised so if you time it right you can get most of the dudes as they come down the ropes.
I tried COD4 the other day on the PS3. Dunno how you console boys can do it, it was so freaking clunky and unintuitive. PC all the way!
