Agree. Opinions based on poor premises or bad reasoning are wrong (especially in the moral sense). For instance,
"Obama is not trustworthy because he is an open Muslim."
Is wrong. (bad premises)
"Obama is not trustworthy because he is secretly a Muslim."
Is still silly, but at least reasonably sound.
"Obama is good because Bush sucked."
Is wrong. (conclusion does not follow from premises)
"Obama is good because he got important stuff done that Bush didn't."
Is better, but still wrong, for the same reason. (this would be fine with the addition of "Bush was a good president" as a premise)
"Obama is better than Bush because he got more important stuff done."
Is fine.
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