only time roberto carlos does a decent free kick is when you're right on the edge of the box close to centre, and you hit it hard and low in between the goalkeeper and the wall. smashes it straight down the middle and close to the keeper but if you do it right the keeper won't even move.
personally i score the most with recoba (this guy is lethal from over 26m), beckham, juninho (shot is too weak to score from more than about 28m though) and rooney. those are the best four for me. havent tried shevchenko, xaxi or del piero. ronaldinho is rubbish for me, deco is okay but a little random.