Where color is bad is where it's: "okay remove everything in x color and add everything in y color".  Especially when they aren't complete lines.  When I'm going through hundreds of lines of code that really is just a nightmare.  I much prefer complete line exchanges because in comparison they're quick and they're easy. 
 
Not adding files or line numbers to non-diffed submissions also is a time thief =( 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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