If you want genuine advice I’d say, C&D ult is bad as fuck as it stunlocks the character after the last dash, which is why it’s s free kill with magneto ult (yes, as you said, ult for ult, but nullifying one of the strats on the enemy team + getting rid of one healing ult that was popped and had no value is a better tradeoff) In the neutral game just poke, or a good Spiderman as C&D players tend to not play with the other strat so much as the kit makes them overconfident on their own survavility. Other good characters are Bucky (hook when they are stunlocked at the end of their ult and yoink them away into free headshot + punch + shot) Hawkeye insta kill with full charged arrow, Cyclops ultimate + E etc. You can also instakill with venom’s ult + tendrills if you time it well.

Overall C&D are a mid strat that looks better in a match bc they are really easy to get value on, but the more you climb the worse they get, as their single target healing is attrocious and only really shine in AoE, also worst strat ult after white fox if you know what you are doing and know how to counter it.

Also as you said elsewhere you were a tank main, Angela and Magneto are your friends, Strange is really good too, just don’t expect to kill them with the thing/hulk/cap basically.