I have to say, 5 out of 10 is far too forgiving a score. I would give it a 3. screen-replacement is a definite red mark. i think i could do 20 s4 screens in the time it takes to do one s5. Those used to previous sasmung galaxy repair can easily find themselves breaking the home button cable if they don't have forewarning. placeing screws behind the display seems very deliberate and cynical on the part of the design team.
this also means that you cannot purchase a new screen with the frame included. you must use the phone's existing frame and align it EXACTLY right. (pay extra to get pre-cut industrial glue). the first s5 i did, the new glass wouldn't align with the steel mic mesh. i had to spend over an hour grinding down the mesh!