Any stun on a DNC will do the job.
In my experience everyone will focus a Dancer who comes in range, Honing Dance will = death. LB will = Stun on cast then death and even if they dont stun you, they just laugh and step out of range before the snapshot kicks in the cast bars so long lol.

Dancers do well if their team mates are there to back them up or the enemy doesn't know what they are doing.
Where we excel is by distracting the enemy from people who can do damage and take a hit, a Dancer appearing behind the enemy team is a good way to distract them from your allies unless they are tunneling in which case your honing dance will def pull them off your allies and onto you.
Just always assume every action, even 1 on 1 will A) Do no damage against 90% of the other jobs, B) Die in a single stun window, C) will always be focused and prioritized down on sight. Just take the death knowing that if the enemy is chasing you or targeting you, they are not targeting the Ninja setting up to one shot the enemy or if you are really lucky, your team will be free to push the crystal.

That said, they are very effective at scaring the enemy off the crystal lol. Dash in, honing dance or start LB, watch the other team panic then regroup to take you out, and hope its provided enough time for your team mates to stop chasing a single person on the other side of the map and actually push the crystal!

That said, a well placed and timed LB CAN stop the enemy long enough to get the crystal to the goal during that final stretch where the enemy are reviving as fast as they can and panic rushing in 1 at a time.

Pretty much dont think of us as a Glass Cannon, dont think of us as Crowd control. Think of us/yourself as a distraction, theres more to CC than K/D/A numbers, as nice as seeing a good K and A score is..... well..... A anyway, were Dancers. XD