Tyler Williams reviews commentaries on Genesis. Tyler is a bit more positive about Walton that I'd want to be. I'm a bit disappointed with Walton's NIVAC in terms of the series' general strength, which is supposed to be contemporary application (and bridging the context from original meaning to contemporary application). Walton seems to have a very strained view of how much contemporary relevance Genesis has. Other than that, I think I agree with pretty much everything else Tyler says.
If you're interested in commentaries and haven't seen his Old Testament Commentary survey, you should take a look at that too. His Genesis post is basically an update to his entry on Genesis in that survey.
Update: Tyler has a followup post that adds a few more commentaries and then offers some thoughts in forthcoming commentaries on Genesis, including some information on when some of them are likely to be out.