Oreimo was good, it has some harem elements but those are mostly overshadowed by the sister loving. The plot of all 31 epsidoes don't make a lot of sense but most of what I wanted to see was in the last episode, so that's OK.
Fortunately the next two anime i have lined up, Hajime no Ippo and Space Brothers, are less about "jeez, i want to bang my sister" and more about achieving an amazing goal and the hardships along the way. Or is that basically the same thing as Oreimo?