GM Mike Walter grades so far on his teams performance

Here's my grades for my players.
1. Wade Boggs D+
2. Babe Ruth A
3. Stan Musial A
4. Harmon Killebrew B+
5. Willie Stargell B-
6. Joe Kelley A+ (Batting average and on base percentage is outstanding.)
7. Hugh Duffy C
8. Lyod Waner C+
9. Ernie Lombardi C-
Pitchers
1. Koufax A+ everything ive ever wanted 3-0 a lot of K's
2. Tom Seaver B
3. Randy Johnson B+
4. Halladay B+