Hi, there! Well, he was living for his hype before the status formula changing. He was going to be on par with Tyranitar as rock attacker and would have better TDO than Groudon. He was supposed to be quite a monster.
Now? he still is quite decent and not exactly useless. Has above average stats, access to two powerful sets and is easier to have for less priviledged trainers. I could even say he is a Jack of All Trades and he has some space now for Heatran raids and the future Dialga raids.
Who knows what Niantic has for the future? Rhyperior still has his signature move in Rock Wrecker or His learning of Earth Power. Should we have a Rhyhorn CD in the future, featuring his shiny form, could be something.
Hope my answer was satisfactory :3