You get everything that they have unlocked untill you die that is, once people learn how to play it will get even better.
Voip works sporadic but adds another dimension to the game.
The default medic gun is pretty good, I like adding the scope to it makes it a killing machine on longer ranges.
Here is a weapon comparison, as you can see most of them are just unlocks not necessarily upgrades.
http://denkirson.xanga.com/722757523/bad-company-2/

