You can't defend a class by saying another is more overpowered. It just doesn't work.
If you say so, you're crying to nerf shadows when there are more important classes and things that need nerfed first. Smash/bubble stun to be precise. There isn't really anything overpowered about 23/1/17. The strength of 23/1/17 lies in utility and 1v1 ability, not in pure damage or survivability. Any pure dps or pure tank class can do that a lot better.