Thanks for all the tips guys, I leveled up to 6 pretty quick because of yer awesome tips

With my Titan I got to level 8 in under 3 hours. I didn't complete the archon quest until level 10. If you have the patience you can farm that first area where you scan that ship and before you retrieve the warp drive repeatedly. You just need to learn the spawn pattern of the mobs as I did in beta. Collect spinmetal leaves and memorize chest locations, every 50 you get can be turned in for exp, rep, glimmer, and once you've level 18 it also gives marks. When the week rolled over I turned in 1000 spinmetal for instant 100 vanguard marks this last Tuesday. I have another 900 and counting now for next Tuesday. After patrol missions become available I farmed the intro area where a fallen walker event is and the next zone over, the rocketyard nonstop. Got to level 20 in under 2 days. But I'm a grinder and I can put up with endless farming, your patience may vary.