I hate to disagree with you, but your opinion is too subjective.
我不想跟你有不同意见，但是你的观点太主观了。
I hate to disagree with you, but I think you view is impractical.
我不想跟你有不同意见，但是我认为你的观点不切合实际。
I hate to disagree with you, but I think diligence is more important than talent.
我不想跟你有不同意见，但是我认为勤奋比天赋更为重要。