When I see standings of some contest, I can see red submissions that failed on system tests or hacked, of course system test failed submissions are in bold font, but also hacked after lock submissions are in bold font. And in order to know whether it's hacked or failed on system tests I need to click the submissions or move the cursor to it. From first look we can't know exact verdict.
So, I suggest codeforces to change the color of submissions that got hacked. Ones which failed on system tests may remain unchanged or visa versa.