I agree to that. Playing an evil race should really have a bigger impact.
If we would play one the cinematic after the fight should look like this:
Aradin and company enter the Grove (if they survived :P) and the gate slams shut. Our party is standing in front of the gate and the tieflings point their arrows at the party.
Then a conversation starts like: "If you did not help us we would have assumed you were with the goblins. Why did you help us and what brings you here"
depending on what race we play that could be a little different.
As goblin: "You are lucky we did not shoot you!"
As Gith that should be really difficult since we know that the scout who was with Zorru was brutally killed by Githyanki.
I also would welcome an option when we are not even let in and have to go look somewhere else. Would be a better start to the Evil path OR to gaining enough trust to be let in. That could be achived by rescuing that Gnome in the cave behind the Door where nettie tries to kill us. Or by actually rescuing Halsin or anything in between.