I think he is doing a fine job given the talent he has.
"Does it bother you when he takes LaHair out in the sixth inning of a 2-2 game, when LaHair is one of our two hot hitters?"
No, because LaHair can't hit lefties(never has) and the 2 back end of the bullpen guys for the Reds are both tough lefties. Don't think it would have mattered either way
"today, he has Mather playing third while Baker plays first"
Everyone has been clamoring for Mather to start and Stewart has struggled, plus as I just said, LaHair can't hit lefties and Baker can. This is a good game to get both of those guys in, which one plays 1st and which one plays 3rd I don't think really matters. Both are equally bad at both positions
"Does Sveum do enough other things well to make up for these no-brainer type moves that he misses the boat on? "
With the lack of talent this team has, I don't think there is such a thing as no brainer move. Other than maybe Garza every 5th day and Castro as your SS