I understand his concern. I hope he is wrong. I remember when Kennedy was chosen - the Republicans were politically motivated to confirm a judge after Bork was “Borked”, and we got Kennedy. Same with Souter and others. Perhaps Kavanaugh will turn out as we hoped, but until he is confirmed, we will not truly know. In that regards, Eddie Munster is right.
He can get him confirmed..and the next judge will be more conservative..there will be more GOP senators
Sometimes the perfect is the enemy of the good. Kavanaugh may be too "establishment" for my liking too, but we need to keep in mind that there are at least 2 Republicans (Murkowski and Collins) who are likely to vote with Democrats against confirmation if Trump picks anyone perceived to be too hardline (i.e. Bork all over again). There's also the absence of McCain to contend with, and the fact that even when present he sometimes sides with Democrats too.
So the question isn't whether Kavanaugh is perfect or even great, but whether he's as good a selection as is likely to be confirmed. As someone else mentioned, he's probably more solid a conservative than Kennedy was, which already shifts the court in a better direction.