Warframe has one of the best F2P models in existance.
The performance is beyond great and can run easily on low end pc's / medium end laptops.
Gameplay is fast-paced and fun but The game is VERY overwhelming though, there is so much freaking stuff to collect, craft, complete, it's insane.(Farming simulator..xD)

"Warframe doesn’t care about balance. You’re a badass space ninja, after all! ... What’s great about being overpowered is that, since everyone is overpowered, no one is."

Overall, totally worth checking out if you are hesitating !