Flaptain gets more flak than he deserves. But he suffers from his age and the fact that there are other characters now who do what he does... better. Since his re-work, 3Falcon is one of them.
I've been using P4nther at 5/4/4 lvl 94 with Shuri and Flaptain (5/5/3 lvl 172), and let me tell you, that may sound dumb, but that team gets out of hand SO fast. Once you get Protector of Wakanda on the board, P4nther and shuri's nonsense gets rolling to the point that matching 3 fortified defense tiles will do outrageous damage on multiple damage pools (each one counts as a separate thing, so if you kill somebody with the damage from the first tile, the second ones move down the line just like Valkyrie's red), and Flaptain's nuke becomes 11 red ap instead of 14, so you might actually get to use it one time before you match them to death. Highly recommend, and can't wait to champ Flaptain and P4nther to see what this does at "real" levels of damage lol.
Cage Wasp and Carol is my absolute favorite 4* team! Special tile buffing for days!