Any grades like the ones TIMVP does SHOULD be based on expectations. A B- performance from an All Star shouldn't look the same as a B- performance from a deep bench or situational player. An A performance from a scrub would be a C performance, at best, from a prime Duncan. It's not TIMVP's fault that you only want to read a single letter, and not all the explanatory information he gives. And it's not his fault that you only look at a single column on a box score.
Come to think of it, your whole OP was based on your expectations, wasn't it? May your chickens all die, and your first daughter's bra have three cups. I have spoken.