At first i was frustrated by the lack of a global chat because i didnt understand zip of what was going on and i didnt have anyone to ask my cazillion questions.
A bit later i came to appreciate the lack of chat, now i like the quiet, but imho global chat will be beneficial to the game and should be implemented.
There are good and bad things about not having global chat, and there are good and bad things about having it, but after all is said and done, i think the good outweighs the bad when you have a chat.