Question about Clockwerk and HoN

So first i don't know much about the subject so any more excperienced player may have more facts.

My main concern is that in HoN meta Clockwerk/Pharaoh was for a time the most popular choice for an of-lane hero(sorta like WR is now) but now that i have gotten more into DotA2 everone always says he sucks, i dont see any difference in stats so what is the cause of this?