Should You Avoid Links from Sites with Big Difference Between PR and MozRank?

[SparkplugDigital]

If a site has a Google toolbar PR of 2 and a Mozrank of 5, does that most likely mean that the site is penalized and a link would probably provide little value.

I know that Google rarely updates toolbar PR so I suppose the site could have also earned a lot of quality links since the last update.

Thanks Mozzers!

[EGOL]

I know that Google rarely updates toolbar PR

You understand this.  It is an important consideration.

I suppose the site could have also earned a lot of quality links since the last update.

If you thought that one email message would get you a PR0 link on loc.gov you would not want to pass it up - even if that page had zero outside links?