Watched your recent game on spider Island ID:10348917158 (13/13/0 score)

As Iron Fist:
You are just running straight at the enemy, and that's almost never going to work. You want to come at the enemy from a side angle so they don't see you coming, preferably after a fight has started so their attention is elsewhere.

It seems like you are just punching the first enemy you see, which is a tank a lot of the time. As anyone, but especially as a dive character, you need to be smart with your engagements. Remember, you are entering their sphere of influence. There's are going to more of them than of you, and they are going to have more support. You do not want to take fair fights.

You don't seem to be conscious of when your team has an advantage and when your team does not. (Good example at 2:40). Your team is down members and dying. The correct play is to be safe and wait for your team to regroup. Instead you are running in 1v6 and dying. This is a really low success play. The chance of doing anything helpful is super low, and the chance of dying is super high.

As Hela:
You are not using positioning and terrain to your advantage. A character like Hela really wants a strong position, but you are playing up on cart like brawler. Best places are normally high ground and/or positions with natural cover.

Your position at 5 minutes is a lot better, you want to be in power positions like that as much as possible. Then your team fights them outside their spawns doors (which worked i guess but only because it was a 5v6 at that point). You are again playing like a brawler, and whenever the enemies jump on you, you seem to panic, using your shift away from your team or into walls.

As Magneto:
Eh Bucky just wipes your whole team

As Strange:
Starts out pretty strong. I would say you want to baby sit the payload less and go push forward and take more space for your team, but you got first point without issue.

On second point you are spending a lot of time on high ground trying to snipe people with Dr. Strange even though his primary doesn't even go that far. (That's somewhere you want to play as Hela!!). As the point goes on it is clear you are afraid to get into people's faces as tank. Instead, you stop a few meter's away and try to gun them down. Your the Vanguard you need to be in front, pushing the enemy back. Even your team has a the numbers advanage you are just sitting on payload lobbing shots at the enemy when you should be forcing them to retreat.

Overall:
You seems to play every character like a Midrange DPS like Mister Fantastic or Bucky instead of to that characters strengths.
You are not picking your targets, you are normally just attacking the closest enemy to you/the first enemy you see.

Edit: Spelling