To my mind, this is essentially Thor vs Vision, Iron Man and War Machine. It could be a brutal, drawn out fight but in the end I see Thor winning.
Vision: The biggest threat here but I don't think it's enough. Even a weaker version of Thor could beat Infinity Stone wielders (Loki with the mind stone in Avengers, Malekith with the reality stone in Dark World) and destroy vibranium (Age of Ultron). This version of Thor overpowered a blast from Thanos with the completed gauntlet. We also saw in Civil War that Vision's weak to taser arrows from Hawkeye so Thor's lightning's going to give him a lot of trouble and prevent him getting close. Sooner or later the lightning's going to stun him and if a powerful blast doesn't take him out then Stormbreaker will.
Iron Man: More skilled than Vision, no glaring weakness to lightning and powerful enough to hang with Thor for a while, in the same way he was able to hang with Thanos. He can hit Thor through the lightning cloak and keep him off balance for a while and I'm sure it would be spectacular but, just like with Thanos, ultimately I'm not sure he's capable of giving Thor more than a scratch. On the other hand, Thor's strong/skilled enough to overwhelm Stark in hand to hand, his stronger lightning blasts would probably overwhelm the suit's ability to absorb it, and one hit from Stormbreaker and it's over.
War Machine: War Machine's on par with the weaker version of Iron Man that brawled with Thor in Avengers. We saw in that fight that Thor can casually crush Iron Man armour and that - despite taking plenty of hits - Thor was just too damn durable for Tony to hurt and the same's going to be true here. Rhodey can help in trying to keep Thor off balance but ultimately, he can't hurt him whereas if Thor gets hold of him or lands one hit with Stormbreaker then it's over.
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As much as I love some of the other characters they're low level superheroes who clearly don't have the firepower to hurt a guy who survived infinity stone blasts and the full force of a star, has a healing factor for stab wounds and shrugs off hits from the Hulk. They can't really help much as distractions either because they won't be able to get close. Thor has a lightning cloak that'll one shot most of them before they can touch him.
Quicksilver: With his speed keeping him safe he might actually be the last man standing for the team but he doesn't have the strength to be a threat or the durability to get past the lightning cloak. He can push some of the other characters out of the way of attacks and make it a more drawn out fight but that's about it.
Gamora: Gamora's sword is sharp enough to wound Thanos so I can imagine it cutting Thor but between Thor's skill, flight and the lightning cloak I just can't see her landing that kind of hit before she's taken out. Plus if Thor's healing factor can let him take multiple stab wounds from Hela then fight an army minutes later then this doesn't feel like a game changer.
Star Lord and Rocket: They both have ways of flying and if they can keep their distance, stay under Thor's radar and line up a shot with the most powerful weapon we've seen them use - the cannon that destroys moons - then they might knock Thor off balance/out of the sky for a moment. In the end though Ronan tanked it and it's not going to hurt Thor either.
Cap, WS, Spider-Man, Black Panther, Widow, Drax and Groot: I can't see these character's getting past Thor's lightning cloak and even if they could they don't hit hard enough to do real damage to someone who can shrug off hits from Hulk. On the other hand, Thor's lightning could take them out just like the Outriders or Hela's army.
Does anyone have an answer for getting past Thor's lightning cloak?
I always forget about the lightning cloak when discussing Thor battles.
Going by Iron Man absorbing Thor's lighting in Avengers, his newer suit should be powerful enough to survive the cloak and so should War Machine. Vision and Rocket/Starlord can stay away from the cloak and use ranged attacks. I don't think it's enough though.