I know I shouldn't think about them as much. I'd probably play better for it and enjoy myself more.
Does score/min mean anything on Master Overwatch? Just saw I'm ranked as #9700 as Tracer and #427 as Reinhardt. Doesn't sound like much but considering the size of the player base...
My Lucio needs work though.
It only ranks you within players that use the site or have been searched for on the site. So that #427 is probably out of 20,000 or so, who knows though. That's why the ranking is inflated however.
Score per min and total score (the stats which it ranks by) do not mean anything though. You can have great games with low scores per minute, and you can have terrible games where you lose, with very high score per minute, and many of the distributions of score are very arbitary. As an example, roadhog player that heals whenever he can will have higher score per minute than a roadhog player that uses his heal at appropriate times, because healing counts toward score.
Team mates also affect it, the best players will have harder times netting high score per minute playing with equally skilled team mates than randoms that others who are slightly more skilled than their team mates in public lobbies. Why? because if you're playing solo then you can get higher score per minute due to crappy team mates not picking up the slack. At low levels of play I've seen even bad players net 50+ eliminations in a match of capture, but at higher levels things are more decisive and less influenced by individual players (therefore, less opportunity for super high score per minute).
Just examples though, plenty of confounds that make it a pretty useless metric.