I've put about 5 hours in on PC...its pretty fun...

Its a sci-fi take on Left 4 Dead's co-op mostly...VERY fast paced...tons of action...but can get a bit repetitive...the weapons and abilites are great, but after you really get your melee attacks leveled up...the game really takes off...

the upgrades and everything are extremely deep...but, its F2P model is pretty strict...where as some free games allow you to easily grind past what you're expected to pay real money for...Warframe would take FOREVER to unlock and rank up certain things...some individual aspects are easy to move up in, but your overall character class and stuff almost HAS to have money pumped in to to really see the crazy options...

not that that is bad...if you pay half of what a retail game requires; you'll have enough credit in game to do all kinds of stuff...

but the core mechanics are great...and the mission structure makes it a great game to blast through for just 30 minutes or something...its not like every thing you do takes hours...

the boss fights are particularly fun when playing with friends...

I've put in about 100 hours. It's addictive and fun, but very redundant. The F2P elements are force fed at times, which I don't like, and the gameplay mechanics are often hindered by counter intuitive level designs.

At the same time, the combat is fun to use, shooting is spot on and the defense missions (surviving waves of enemies) are challenging, along with the upper tier planet stages.

It's mostly free to play, which is great if you want to just get a feel for the game, but later down the road you will be forced to spend cash if you wish to explore other aspects.

I like it, despite some of the above mentioned gripes and it's getting better with regular updates and hot-fixes.

thanks guys sounds interesting.