If this is Joe Mauer.....then yes, he will be blocking better players. I'd argue that Sano s/b at 1B right now, with Plouffe at 3B..... He's one of the worst hitting regular 1B in baseball......you owe it to the other players and the fans to put the best players on the field. I'd say if this is how he plays all year, you have to consider benching him next year. Or, you can just keep putting him out there, even though he is bad at his job, and not be trying to be the best team you can.