Remove him from the board and it's over.
Thor can do that. His electricity will charge up ironman and not do much to Thor beyond maybe surprise him once. Caps shield can block it.
Hawkeye can tag him with an arrow as i doubt doom has the reflexes of loki not that I think it can do much but it's a distraction. Same with black widow, distraction.
Iron mans armor could withstand the flames of Johnny torch and give some good anti air fight. A dog fight between the two would be awesome but he wouldn't go unaided by Thor who would take Doom off his board or stress his shields with a hammer throw or lightning strike. He ended the destroyer armor he can take Doom and his blasts.
Not sure what cap can do. Give his shield to ironman? Strike the board from below? Idk.
Doom looses.
Doom with the amps should pick apart the Avengers. Hawkeye, blackwidow and possibly cap depending on how he uses the shield are non factors. Ironman even if he can charge with the electric attack Doom generates who is to say he just couldn't keep shooting him? Overload the armor and possibly detonate it if not just kill the armor in mid flight as I dont see doom coasting anywhere near the ground in this battle.
Thor and hulk are his biggest challenges. He has the speed and power set to take them down hard with maybe getting hit with a few good hits.