So, the only current game I wanted to rent from Gamefly was Gears of War: Judgement, but it had a Very Low availability so I added Resistance 3 to my list after hearing someone recently talk about how good it was (and remembering Yahtzee's praise for it). I played it for an hour and decided to Keep It - the fact that it was $13 definitely helped that decision.
It's really good. From a gameplay perspective, it's one of the best shooters I've ever played, and the visual style is really impressive too. There aren't a whole lot of bells and whistles but the visual effects like motion blur and lighting-contrast (I played a scary level last night and the look of the flast light was fantastic) make it look very cinematic. The weapons are ALL fun to use and varied, and the enemies are varied and surprise you with their locomotion skills (they fly, hop, and climb all over - even the BIG enemies). I can't get enough of it, even playing it over Bioshock Infinite during my free time. Although I won't deny that the protagonist's name of Joseph, which is my name, made me a little more invested in the story than I should've been. Speaking of the protagonist, I also love the fact that the protagonist isn't silent in cutscenes, but he's silent during gameplay. Such a simple and effective design choice, I'm surprised it's not more common.
So, if you're a fan of shooters at all, check it out. It feels like an alternative reality shooter, an example of what the current shooter market would be like if Gears or CoD (both of which I like) hadn't permeated everything.