Champs that splitpush all day (including singed) are good for climbing since people don't really know how to deal with splitpushers until relatively high elo.
This is only true assuming you're good at splitpushing however, so know when you can push and when you need to back off. If you're always off on your own splitpushing, and constantly get caught and killed, then you're basically just a feeder. If instead you're being super annoying and constantly applying pressure, eventually towers starts falling and next thing you know you're knocking down their inhib while the enemy team is all "we can't chase him since he wants us to do that, but we can't ignore him since our base is going down, so ???".