Well, I tend to agree with the sentiment expressed by this thread on the beta forums, which praises the 1 copper respecs currently available to beta players. Of course, not everyone agrees -- there are also those who side with Blizzard's standing opinion on the matter, which states that your talent spec shouldn't be a casual decision, and ought to mean something. And perhaps poster Warrenders hits the nail on the head when he explains that:
It would invalidate talent choices and specs as everyone can be any spec they want any time they wanted. Why not just make all talents baseline skills and be done with it then?
But regardless of your opinion on the issue, there is some excellent discussion -- from both sides of the fence -- here.