the good part is you get plasmas and you are hard to get shot in the head in snipers. the bad part is you cant see in front of you you are fat in you will be a big target every body hates to be a covenet elete.
I think being the Arbiter in campaign is a good thing, because his cloak is very useful, but in multi player, since he doesn't have cloak he is kind of useless. His head is lower, and some of his color schemes are really cool but other than a slight, very slight, advantage over new snipers, he is weaker than the chief. His shields don't recharge as quickly as the MC's and they seem weaker, he also seems slightly slower than the MC.