considering it's marvel, a game famous for instant game changers I would think you're actually underrateing DP mode. As long as she's in the mode you can switch out to a different character and use her powered up assists as well as recharge her scratch damage. She does great damage and as long as you can keep the momentum of the match in your favor it's a huge buff. combine that with a lvl 3 or even a lvl 2 x factor and your team is looking pretty scary.
as long as you keep her out of the fight until you have about 4 bars you can be able to confidently use her and your opponent will be forced to take her out before that final bar or have to deal with DP for the rest of the match.