With all due respect, I don't think that's a bad thing.
By all accounts, Roberts respects the Constitution. I believe I've read that he's a member of the Federalist society and that his wife belongs to a pro-life group. I think these things are a better indication of how he will vote in the future than who happened to pay his law firm for assistance in a particular case.
Did respect the Constitution when he worked to overturn the Colorado law in question, which was perfectly Constitutional?