I wouldn't say (something) is (adjective). (A different description)
When you want to slightly disagree with someone's opinion or description, use the phrase "I wouldn't say ___ is ___" and then say your own opinion about it:
I wouldn't say it's necessary to have a college degree, although that does help.
Well, I wouldn't say he's the best player. He good, don't get me wrong, but I think there are a few others who are a bit better.
When you disagree in this way, it sounds like you're only slightly changing what the other person said, so it's a pretty polite phrase.