The best items I have at lvl 14 are from the Moon Strike, running it a second time was totally worth it. I keep playing lower levels with friends, so I haven't hit 20 yet, but once I do I'mma just run Strikes till the raids come out. Might patrol some to get Vanguard level, too, since some cool gear seems connected to that.

But yeah, just the difference between a blue item and a green item is HUGE.