I've played in a Rippers game briefly. It was pretty cool, although we found combat resolution against large monsters kind of unsatisfying (most hits are ineffective until someone gets a really lucky roll to beat its Toughness).
I haven't actually played with the Necessary Evil rules, so take this with a grain of salt. They look interesting, but the power levels involved looked more like White Wolf's Adventure! than something you'd see in typical comic book supers. (The Brick archetype talks about throwing a city bus around in the blurb, but the character as statted can lift 400 lbs. That really turned me off the whole thing.) I've heard others say that NE got the comic-book feel right, though, so maybe it plays better than it looked to me.