Murray's forehand is incredibly ugly in my opinion and although he's improved his technique in recent years it still lets him down quite often. That's why he struggles to go down the line with it and why it lands short so often, especially on clay courts.
I just don't see what you're looking at.
For the most part, his forehand technique is pretty textbook. Since Lendl, he seems to point his elbow on the take-back, but other than that, it's your standard "half circle" loop.
Where his technique differs from most players is when he's in the "loaded position", right before hitting the ball. Where most players employ a double-bend technique (wrist and elbow bent), he keeps his wrist firm.
is the real source of his error, imo, because it means he has to exaggerate his swing to open up his racquet face appropriately. That, I believe, leads to his second major source of forehand err (and arguably his biggest), which is his tendency to lift his head too soon on the shot. While these things are potentially problematic, they hardly seem aesthetically offensive.