You don't need to be social to use LFG. Just write: /lfg XXk GS <Class> LF <Dungeon of interest> <enchant/stone if you have them> Press up in chat to have the message rewritten, spam until you get an invite.
PVP isn't worth considering for the purpose of this build. You're never going to be at your full potential if you didn't start with a high CON roll; penetration and survivability are superior to extra damage for it. You can do it in the way that any GWF can naturally PVP, and a high CON sentinel IV will be far superior for…
The GWF and DC artifacts give significant bonuses to your personal damage. Lantern has a relatively short uptime, so it's not always possible for the party to capitalize on it. It depends on how much of the party's damage you're doing, but the GWF and DC artifacts only depend on your own performance.
With regards to SM vs IV, it's basically FLS vs Weapon Master's Strike and Crescendo. FLS does about as much damage as it used to pre-nerf with the Unstoppable charges applied, to 5 targets, so it is an excellent AoE skill. WMS and Crescendo are intended for better single target damage. I prefer SM since I tend to have 2…
GWF AoE powers are useful for doing initial pulls, but they're not as strong as those of CWs or HRs for dealing with packs of mobs, so one should primarily focus on doing single target damage on elite mobs while drawing some aggro off CWs or HRs. The usual setup for CN is 1xGWF, 3xCW, 1xDC. This build is adapted for that…