He really might though.
One on one Obi and Anakin might beat him by using telekinesis through the armour, but with so many distractions that just isn't feasible.
They go down hard. Either they try to take out Iron Man, thus opening them up to being shot to death by 51 blasters, or Iron Man bombards them with missiles and kills them while they struggle to block 51 blasters' bolts.
They can't win.
Nope. Wrong. Incorrect.
Fact: It took more than 25 to 1 to overwhelm Jedi in the battle of Genosis ep2; that was with Clone Troopers, who are way more competent than the utterly incompetent Stormtroopers.
Obi or Anakin deflect one shot, it's likely to kill all the Stormies and possibly take out either Iron Man or Jango.