Which, by the way, I liked. I don't really like respecs, especially unlimited ones. It was perfectly possible to play through the first difficulty (and the second if you were somewhat decent) with any build; making a correct build only really mattered over level 60, going into Hell.
A game's difficulty in speccing should be such that a casual gamer who doesn't want to use spreadsheets or look up forums, should be able to play through the normal difficulty. I think it's reasonable to expect people who want to finish a game on the hardest difficulty need to plan beforehand. If you're playing an MMO or other such gale where both are - by nature - intertwined, yes, you probably do need some respec capabilities.
A game's difficulty in speccing should be such that a casual gamer who doesn't want to use spreadsheets or look up forums, should be able to play through the normal difficulty. I think it's reasonable to expect people who want to finish a game on the hardest difficulty need to plan beforehand. If you're playing an MMO or other such gale where both are - by nature - intertwined, yes, you probably do need some respec capabilities.