I too received my Last Word from VoG this week and I am excited that xur is selling it. I believe it is one of the funniest guns to use in Destiny. Now did I deserve my TLW more than someone who purchased it from Xur? No I did not. I was randomly rewarded it for completing a raid with the help of 5 other people. Any of those individuals could have gotten it or something better based on pure luck. In short nothing gifted to you from RNG is truly earned. The only exotics that are actually earned are those awarded for completing exotic bounties.