I guess I'll hold my opinion on the Rinnengan til we see more of what it can do. So far, the Rinnengan seems to be on par with the power of the Sharingan. I wonder if there are different variation levels that the Rinnengan can achieve. If it is, then I'll definitely say the Rinnengan is overpowered. You don't think all the jutsu he's been performing like the Shinra Tensei, soul absorbtion jutsus, and that reviving jutsu? Not to mention that jutsu that leveled Konoha.
Just so you know, you mentioned the same technique twice.
Shinra Tensei was the Jutsu that leveled Konoha. It's just that since Nagato was concentrating all of his chakra on God Realm, it turned from being a gravity push to a gravity bomb.