The Jordas Precept - 17.5 - Trinity Prime
I've played Warframe a fair bit, and while some of the complaints I've read earlier in the thread are somewhat valid, the rate of progression (xp, acquiring new frames, guns) has been greatly exaggerated though. It's very easy to level up in the game, and get all those cool mods, guns and warframes without spending any money. Warframe is easily the least P2W F2P game I've played yet.
With a little googling around, a brand new player without the aid of anyone else can expect to get to Mastery Rank 6 in a matter of days without touching their wallet. Which isn't where ALL the good shit comes from, but it's a pretty good start. Warframes power curve isn't about what level you are, or what level your frame/weapons are, it's about the mods you've got, and what level they have been upgraded to. From there it's a matter of what mods you can fit on those frames and weapons. Some people don't really realise that, and just assume that once they level a weapon to max, or a frame they won't get any stronger -- which is faaar from the truth. =D
The currency "platinum" is tradeable, along with mods and prime weapon/frames parts, so there's a thriving community economy where it's more than possible to get some cool shit and sell it off to buy that custom skin/wierdshit/mod/prime warframe/weapon/warframe slots that you feel you need.
The introduction of the 6 factions with even more weapons and the new warframe ability augments are awesome... it's always fun when your hated faction sends a full platoon death squad of Eximus class mobs mid mission to kick your arse. With that, the threat of Stalker, Zanuka, and the G3, there's always the possibility that mission you chose to level up a new weapon (without a backup) wasn't the best of ideas.
I know the game pretty well, there's not much I haven't done and can offer help with just about anything. If you are thinking about starting up, if you use the referral you'll get a 7 day XP booster which will help a fair bit in getting through the early stages to fit some of those mods you've picked up along the way.
I'm not a founder, I've spent very little on the game (50 bucks on a 50% discount) and I'm Mastery Rank 19, so there's not a lot of frames and weapons I don't have, or haven't at least built and used. So if you've got a question about something, ask away.
Referral link for those that want to give it a go on PC IGN --
NightmareSabbat