While Bush's record on domestic spending, trade, and border security leave much to be desired, his record on judicial appointments has been stellar. Why would he break from that excellent record on his most important judicial appointment of all? There is no reason to believe that he would.
Harriet Miers was not my first choice. Indeed, she wasn't even on my top ten list. But there is no evidence that Miers will be a pro-Roe vs Wade Souter clone. The fact that Bush chose a stealth nominee shows that there are too many Democrats in the U.S. Senate. With Democrats using the filibuster as blithely as they do, Bush had few good options and did the best he could with the cards he had.
I believe that conservatives will be satisfied with Miers record on the Supreme Court and her critics will be stuffing their faces with crow.
Miers could be a perfect justice and the nomination would still be a missed opportunity because it says that conservatives can only get on the Court if they hide their conservative ideology their whole life prior to that point.