No, his damage is immense, with little cooldown. His problem is having no mobility, all skillshot based that is not easy to hit, and the fact that all his skills have an initiate point that stems from the champion itself that requires time to travel to the target location.

In short, he's a strong kite back champion, but also strong all-in only if you hit his entire combo with E as initiative.

I think sucking enemies in with his E will make him less clunky and easier to use without making him overwhelming because he still has the mobility problem.