Definately negative.
Personally, I'm of the opinion that base classes shouldn't have alignment restrictions. Where the flavour of a class doesn't require those restrictions, they should just be dropped. Where the flavour of the class does require the restriction (specifically, the paladin), then the class should be a PrC.
However, my big objection is to the specific restriction. I have played with at least one player who would immediately leap on that class if it were allowed. He would then proceed to use the alignment restriction as justification to run his character as a bad caricature of CE behaviour, regardless of what the alignment on his character sheet was.
Consequently, that class was banned from my game the moment I saw the alignment restriction, and will remain banned permanently. Which, to me, suggests the alignment restriction is negative.
(Incidentally, during character generation, I only allow characters to be created with a Any-Good alignment. Once play begins, alignment can shift as appropriate to the circumstances of the campaign. I have no problem with Evil characters... but I don't want the game starting out that way. That being the case, the Hexblade is also barred from my games, so that's another alignment restriction I don't like.)