Only level 12 but I'm having alot of fun. I need to follow David into PVP and earn me some Marks of Victory. I want that Lancer Cutter!
You can do most of the missions with a group. That way you will do missions very fast and gain lots of xp.
Locust Corvette was one of my favorites levelling. Oh, and there are ways to slip through red zones - if no one's showed you yet, let me know and I can offer some pointers (or hell, I can probably spin up a low lvl alt and just show you...)