I agree that the game was released a bit to early also, but I do think the voice overs are worth it for a few reason.
I listen every bit of dialogue also myself, others to me its just like buying a standard single player RPG and being told in at the start of the game kill everything and following the waypoints untill lvl 50.
Reason and story are what keep quite alot of ppl interested and alot of games have failed for having a lack of it. not having to read over lots of txt just to find out why you need to go and do this and that etc is a huge bonus. AGe of Conan for example had VO for the first 20lvls in the starting area and alot of ppl felt a bit misled when they realised that as it, they would have to read everything from that point on.
Also I think the VO adds that lil something that seperates it from other MMO's which is whats needed, without that lil something different everyone knows ppl just compare most if not all MMO's to WoW.
As long as the rest of teh game doesnt suffer and I think they understand, they should keep doing it.