I've seen the gunplay and it's pretty terrible. So basic. Probably cause they don't want you to use them, like in Mirror's Edge. It'd have been cool if you could just hold your hand out and shoot tiny shards of yourself at other people, then replenish your "ammo" by consuming. That sounds so cool just describing it that I don't know why they didn't put that in the game. That'd have been sweeeet. Instead they just put in claws and blades and a club. I don't like how they've got that whole "this power for that purpose" thing going on. Why can't you just unlock powers and do what you want with them? Sure, I unlocked this thing that would make fighting that easier, but what if I want to use my claws? Can you do that? You probably could, but it'd be stupid and take forever. So ok, how about the opposite way. I could use my club to crush those puny soldiers, right? Probably, but it'd just be faster to take out the whip/claws. At least in inFamous, when you unlocked a power, it wasn't for any one purpose. You got your powers, then you did what you wanted with them.
I do agree that inFamous is repetitive. The game wasn't as epic as I was hoping it'd be. Zipping around on the power lines and jumping from rooftop to rooftop was kinda cool. Standard movement isn't as fun as Prototype's since you're still mostly human in inFamous.
From what I understand about the plot of Prototype, isn't it Alex Mercer going around trying to find out what they did to him and "who he is" and get revenge for some...reason. And to complete this task, he must go around and kill thousands of innocent lives so he can, you know, be a dick. "Yeah, you guys gave me ridiculously awesome powers and made me super awesome and stuff, but I didn't ask you to, so I'm going to kill you and about half of Manhattan now." I mean, really? Really? Oh, and he has amnesia or whatever. So instead of cutting himself, he cuts other people. In half. Frequently.
If you want a good "karma" system, get Alpha Protocol. Also, it's a modern-day, 3rd person shooter spy RPG. Seriously, get that. They should've just called it "awp's Game". Oh, and those decisions aren't black and white and they actually affect the gameplay and story and your character development and everything. I can't wait for that one.
The only thing that you get in Penny Arcades is that you get to keep your character, sorta. I think they kinda messed him up when I started the 2nd episode, but he was close enough... So yeah, that's basically it.