Yeah his ult feels a bit odd at times, plus I think they stripped quite a lot of range off of it, I remember sniping from more than a screen away... As for taking the harassing away I think that was in order to push Kog into an specific play style because in all honest, Kog has the most overlap out of all the ADCs :S
Sniping and health% are
things
Tank melt and hyper carry are
things
Range flexibility and machine gun are
things
Resistances shredder and magic damage adc are
things
I think Kog had an interesting niche as the Attack speed breaker but that came with a heavy balance price. The biggest problem after the unrework is that Kog will bring nothing unique to a game and he's in a very weird spot balance wise.
For example only his ult scales off of AD, everything else wasn't meant to scale but instead it was meant to benefit inmensely from Attack speed, which he'll lose and his kit will be in this kind of limbo without any kind of scaling aside from... AP? which btw is there as a valve instead of an actual scaling ratio.
I like that they are removing the broken side of Kog though, but I think that they have a looooot of follow up work to do