Gamers are a tricky bunch to buy for around Christmas. Now, Call of Duty, Medal of Honor and Battlefield might be totally different properties to you and I, but try telling that to your nan. She has the unenviable task of picking out this year's must-have from a shelf full of has-been shooters and copy-cat clones. No wonder you end up with the wrong game under the tree. Oh, and when they do get it right, it's most probably for the wrong console. Try again next year.