I value def and range a lot at 2nd,cf and ss. My baselines are 85+ all spots at ss. 75,80,80,80 3rd. 85,85 2nd and cf. These can vary some as if a guy is 90,78 at 2nd or cf or 80,75,78,75 at 3rd etc. The only way Id let it go below is if they can hit really well or I was unsuccessful finding a replacement. I love playing teams with a 76,66 at 2nd. To be honest the guy would have to hit 1.000 + ops for me to even consider it and then id move him to lf or 1st because I like to win. I am not critiquing as everyone like to do there own thing I just know how I play wins. Just like in real life our 250 lb slower guy isn't going to be covering the outside receivers it is going to cost us we all know it. I do not know what constitutes a - play for sure but to me just being on the field in a position below specs would be a - play.