I agree. For anyone who doesn't know what Thor buster armour is though:
From wikipedia:
Thorbuster
* First Appearance: Iron Man vol. 3 #64
The Thor-Buster armor was designed by Tony Stark as a precaution against King Thor -- in case his good deeds went bad. The power source for the armor was a mystical Asgardian crystal, originally part of a new type of power generator that Thor left Tony Stark to possibly use as a new energy source for mankind. Outwardly, it resembled the Asgardian Destroyer. Because it could absorb and utilize the massive amounts of energy Thor turned on it, in terms of raw strength this armor could be the mightiest Iron Man of all. Nevertheless, it was ultimately destroyed by King Thor, its power source undone.
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Supermans speed is the key. He dismantles the armour whilst even an extremis enhanced Irom man would be thinking of reacting. The Thorbuster armour although powered by Uru and magic was not as fast as Extremis.
Yeah, it's speed that should do regular Thor in anyway in a fight with Supes. It wouldn't be written as such, likely, but Kal's speed is quite the trump card.
at the beginning of the fight between thor and thor buster im was a stalemate, he lost in the second issue though . the fight should be on a respect thread somewhere.
All the DC fans here wouldn't object to Batman building a similar suit of armor to take down Supes (this is pretty much what Batman's armor would look like and Tony has more experience building armor)...
Batman had 10 years prep building that armor, with explicit knowledge of Superman's fighting tactics and weaknesses, he knew Superman would hold back during that fight and Superman could have easily killed him. Tony has no such thing here, he's gonna get stomped.