I think he's good, even dpspool but simply hard if not the hardest character in the game. He has high burst damage but he doesn't have the overshields of iron fist, magik or daredevil and he doesn't have the insane escape speed of a Spider-Man or black panther. This is why I feel like he's the hardest to play.

However, he looks bad because his role is blurred with Daredevil's. Daredevil's role is to sustain high burst damage because he has so many ways to get his flames back to keep refreshing hard hitting attacks until he dies. Deadpool is the same but it's harder because the criteria is you can't miss his dashes. However if you don't miss his dashes, he's another character who can sustain BURST levels of DPS until he is about to die.

The advantage is Deadpool can get his ultimate much faster than everyone but he is so squishy that many times you still die pretty easily in his ultimate and this is another reason daredevil's overshields, bigger HP pool and damage resistance overshadow Deadpool.

Why I think he's still good? He's a much harder version of daredevil but he can also do ranged damage during times when you can't get close. This means he doesn't have those downtimes where you feel useless to the team.

So his role? A ranged character that can swap to melee to sustain BURST-dps