State of Quinn

So it seems to me that with the current Quinn setup, she tends to either do great early game and snowball into an unstoppable force, or she becomes more or less useless for the rest of the game (in terms of anything that has to do with champions fighting). She can split push kinda alright, but that's about it. Is this anyone else's experience?

It's fun and all when you do fantastic early on, but it's a little frustrating any other time (not just when you do really badly, but even when you're doing alright).