Yeah. The pros are getting annoyed at ring sparrers. Snk thought about giving newer players a chance to win sparring by offering them the most spammy weapon ever to come to era. It has by far the most spread in the game meaning it can shoot diagonally.

The reason why it's hated by many "pros" is the fact that it's huge spread and ultimately fast fire rate along with no freeze makes it a cheap win. While it does low damage, it wears down the enemy easily due to the insane amount of rings flying everywhere.
All the ring user needs to do is spam the rings without worrying about the aim. All they need to worry about is dodging the enemy bullets. They can run away while continuously spamming the rings making it a bit harder to approach the ring user.

Rings are cheap to buy. Anyone can use them. It destroys the purpose of era sparring. The form of sparring has turned into a game of who can last the longest under the rainbow apocalypse.