IMO the Reds' failure to hit right handed pitching well was one of its serious issues in 2011. The team was excellent v. LH pitching, but the numbers were far worse against righties.
There were a number of hitters with over 150 at bats who didn't hit righties well. They are (excluding pitchers), using the OPS measure:
Cairo - .700
Hanigan - .685
Lewis - .683
Gomes - .654
Rolen - .648
Stubbs - .636
Renteria - .623
Janish - .531
Again, this is OPS against right handed pitching.
The Reds have potential to improve in this area. Several of these players are gone or unlikely to be with the big club. Hanigan's .685 isn't terrible for a catcher who hits lefties better.
Rolen will hopefully be healthier and supplemented by Francisco who hits righties MUCH better than he hits lefties. Hitting RHP is his forte.
Stubbs, picking up from the Stubbs thread, hopefully will sit against some tough righties, with Heisey and Ludwick needing some playing time -- they each generally hit righties better than Drew.
The Reds don't have a lot of lefty bats, it's Votto, Bruce, Francisco, Willie Harris when he is up with the club, that's mostly about it.
So even without a major infusion of lefty hitting this off-season, I'm hoping the Reds perform better against RHP this coming year.