Ranked good at Google, but poorly on MSN and Y!

What might be the reasons?

[Soso]

Hello,
I have a small niche site with articles, where about 90% of them are from various free articles directories. I am also running Adsense on my site.

I am looking at the referral numbers from a couple last days, and from Big Three, I've got the following number of visitors:

Google - 712
Yahoo - 23
MSN - 19

Is this a normal pattern? Could the Adsense be the problem of bad ranking in MSN and Y? Or the duplicate content? Thank you.

[sunny_kat]

Adsense cannot be a problem for your outranking in Yahoo and MSN.

Just check your Optimization strategies as compared to your competitors in Yahoo and MSN.