The 50 f/1.4 is a pretty crappy lens. The USM motor and focusing ring aren't made very well. Invest in some L lenses and don't look back.
No. I'm guessing you made this comment to see what kind of reaction you would get. Yes, the motor and focusing ring aren't what I would consider top-notch, but that lens can hardly be considered 'crappy'. The images it produces--by far the most important consideration of a lens--is virtually indistinguishable from the 50mm f/1.2 L, which costs about 3x more.