Opinion

Why some people say Deadlock is too OP while others say she is useless? Why the clashing opinion tho?

Because people have varying intelligences and people who say she is op are braindeadge

She is good to hold sites against teams who plays agro but completely uselss as pure sentinel

and pls pick proper sentinel in ranked dude she isn't too op or can hold site alone like kj or Cypher

Content creators trying to make people more interested in the game.

"OMG! Deadlock the best agent in the game! Play now! You'll enjoy her immediately. Make sure you like and subscribe now for more content!"
Also some people believing content creators.

Yes