Catapult feat and similar nuke abilities, need a nerf. I use the Warden, I enjoy all the free kills, but I know it's total crap.
1) Using something like Catapult should not guarantee a kill. It is so powerful, you could double the time it takes to come down and that would be 100% fine. You would see get to nuke enemies engaged in combat or running into a zone. Right now, if timed right, you can't actually escape it.
2) Easy to abuse. I fought a clan of 4 wardens and they all chained their catapults on their own team while fighting, because friendly fire looks to be something like 30% damage. They're just plow through my team and that's just a nonsense way to get that done. Even with the longer fuse this would still be doable, but at least you would have the chance to roll away if you are not engaged in an attack (GB, Attack, Execution you would still get hit and smash your mouse, but ok).