I don't know about less impressed. Reach is great, but you have to be able to use it properly as well.
Look at Struve for example, it took him forever before he kind of got used to his long lanky limbs. He used to get hit all the time, but now his striking is a lot better.
Jones on the other hand is fast and agile for a long limbed guy and outwrestled an Olympic wrestler, outbrawled a brawler, submitted a black belt etc. etc.
He is definitely impressive and one of the best ever.
I don't know how well he will perform against top 5 HW's or HW's who are just massive though. I don't see how he beats guys like JDS or Miocic stylewise - bigger better strikers (especially punchers) whom he is not going to be able to take/hold down. And he could have trouble with the Ben Rothwell's of the world by the sheer size and strength difference.