I think you need pretty good gear to get maximum mileage out of Attikus. I have decent AS and AD stuff, but I’d really like to have baned stuff with AS/AD and Recoil or Reload as the bane.
The main challenge I have when trying him is that Pounce has such a long CD. You can’t use it as an engage, then fight for a bit and use it for escape; it won’t be up soon enough. So you wind up either running in and using Pounce to disengage, or Pouncing to attack a weakened enemy you know you can quickly kill. There’s no median of utility there.
Still, with Tenacity and AS gear, he’s scary if played conservatively. At 7, he gets a native 20% boost to AS if you take that Helix; by then IMO he has one of the highest melee DPS benchmarks in the game.
His Helix has two very good choices at 5, both of which are unfortunately overshadowed by Charge Efficiency (mutation, rank 5) since it allows him to use his full-charge abilities MUCH more frequently. The full-charge benefit is absolutely required to make his Ult into a timed nuke, so everyone goes with that mutation.
He’s a fun character, but IMO his detriments outweigh his benefits right now. If he can just whale on you he feels army as hell, but there are too many limitations on him to make doing the whaling easy. I’m hoping he gets a little love in one of the tuning patches coming soon.