I've never played Mass Effect so I can't comment on that one buddy. But Dead Space is one of my favorite games ever. Just a great shooter/horror game. It will make you jump. Guarantee it. I bought the Dead Space 2 on Tuesday. With the power going out for 2 days I haven't played it too much but what I have played, it's going to be great. It's getting great reviews. I love horror games though. Not sure if that's your type of thing.
Question about Mass Effect cause I was looking at that as well. Wasn't Mass Effect originally a 360 exclusive? Is the original Mass Effect on the PS3?