It's exactly because it is hit to Guzan's strong side and he covered that area well that the freekick is amazing. It's easy to replay it slow mo 10 times and think the keeper can save that but in real time you see it hit and go oh my word, how did he place that?
It's no difference even if you put someone as tall as Courtois or Forster in goal. That kind of placement and trajectory makes it very difficult for any keeper to get to it with the element of surprise. Guzan himself is a very good shot stopper and Messi made it looked easy.
Sometimes it feels as if Cech is a superman here and expected to save everything good. He himself concedes many long range efforts that are extremely soft. Just yesterday Turkey's 2nd goal is pretty similar to the one Ospina conceded against Guediora where some blamed him and say Cech saves that easily. It's not as simple as that when the shot is hit with power and accuracy and your defenders don't protect your goal.
